When an engineer designs a highway curve, how does he know if it will be safe for the cars that use it? Formula for the radius (R) of a curve with a banking elevation or slope R (m): 1600 /15m +2

a. We have shown that α + 1 = β.

b. We have shown that α² = β.

A substance that cannot be broken down into another substance is referred to as an element. Because each element is made up of its own type of atom, each element is distinct and distinct from the others.

Since K is a field with 4 elements, the nonzero elements of K form a cyclic group of order 3 under multiplication. Let us call this group G. Since G is cyclic, it has a unique generator, say g. Then we can write G = {1, g, g²}.

Now, since α and β are both in K but not in Z2, they must be elements of G. Moreover, since K contains Z2 as a sub-field, α and β must be roots of the polynomial x² + x + 1 over Z2. Therefore, we have the following possibilities for α and β:

α = g

β = g²

or

α = g²

β = g

a. Let us first consider the case where α = g and β = g². Then we have:

α + 1 = g + 1

= g² + g + 1 (since g³ = 1)

= β + α + 1 (since β = g² and α = g)

= β

Therefore, we have shown that α + 1 = β.

b. Next, we will show that α² = β. Using the same assumption that α = g and β = g², we have:

α² = g²

= β

Therefore, we have shown that α² = β.

Learn more about polynomials on:

https://brainly.com/question/4142886

#SPJ11

Answer:

$546

Step-by-step explanation:

It is given that the variables:

a = adults

c = students.

There are 6 adults, and 38 students. Plug in 6 for a, and 38 for c in the given expression:

[tex]15a + 12c\\15(6) + 12(38)[/tex]

Simplify. Remember to follow PEMDAS. PEMDAS is the order of operations, and stands for:

Parenthesis

Exponents (& Roots)

Multiplications

Divisions

Additions

Subtractions

~

First, multiply 15 & 6, and 12 & 38 together:

[tex](15 * 6) + (12 * 38)\\(90) + (456)[/tex]

Next, simplify by adding:

[tex]90 + 456 = 546[/tex]

$546 is your total cost.

~

Learn more about solving order of operations, here:

https://brainly.com/question/15840745

Sarah's profit-maximizing amount of output is  200 Sandwiches per day.

At the intersection of marginal cost (MC) and the demand curve, a firm will be producing the level of output where it maximizes its profit. This point is also known as the profit-maximizing point or the point of allocative efficiency.

For the given diagram or graph, Sarah's profit-maximizing amount of output will occur at the intersection of the marginal cost curve and the demand curve.

This point = $8 and 200 Sandwiches per day.

Learn more about profit-maximizing point  here: https://brainly.com/question/28253283

#SPJ1

Note that if x1 = x2 = x3 = 0, then the constraint is satisfied regardless of the values of x4 and x5.

a. The constraint for choosing no fewer than three projects can be written as:

x1 + x2 + x3 + x4 + x5 ≥ 3

b. The constraint for selecting project 4, if project 3 is chosen, can be written as:

x3 ≤ x4

Note that if x3 = 0, then the constraint is satisfied regardless of the value of x4.

c. The constraint for not selecting Project 5 if Project 1 is chosen can be written as:

x1 + x5 ≤ 1

Note that if x1 = 0, then the constraint is satisfied regardless of the value of x5.

d. The constraint for staying within the budget can be written as:

100x1 + 200x2 + 150x3 + 75x4 + 300x5 ≤ 450

e. The constraint for selecting no more than two of projects 1, 2, and 3 can be written as:

x1 + x2 + x3 ≤ 2

To know more about constraints refer to

https://brainly.com/question/30409671

#SPJ11

Approximately 25% of the tomatoes weigh less than, given the standard deviation and mean, A. 93 g.

25 % of tomatoes is the value that we are looking for. On the z - distribution table, the closest to this amount is 0.2486, and this has a z - score of - 0. 674.

With this z - score, we can use the z - score formula to find the amount that the 25 % of tomatoes weigh:

z = (x - μ) / σ

-0. 674 = (x - 95 ) / 3.6

x - 95 = -0. 674 x 3. 6

x = 95 - 2. 4264

x = 92. 5736

x = 93 grams

Find out more on the z - distribution table at https://brainly.com/question/24213960

#SPJ1

The number of different fruit salads that can be made using up to three  different fruits is 41

The number of ways of selecting r objects from n unlike objects is given by combinations

ⁿCₓ = n! / ( ( n - x )! x! )

where

n = total number of objects

x = number of choosing objects from the set

Given data ,

For each possible number of fruits (1, 2, or 3), we can count the number of ways to choose that many fruits from the available options and then sum up the results

To make a fruit salad with one fruit, we can choose any of the six available fruits. There are 6 ways to do this

To make a fruit salad with two fruits, we can choose any two fruits from the six available options. This can be done using the combination formula

C(6,2) = 6! / (2! x (6-2)!) = 15

So, there are 15 ways to make a fruit salad with two fruits

And , To make a fruit salad with three fruits, we can choose any three fruits from the six available options. This can be done using the combination formula:

C(6,3) = 6! / (3! x (6-3)!) = 20

So , the total number of ways A = 6 + 15 + 20

A = 41 ways

Hence , the different fruit salads is A = 41

To learn more about combinations click :

https://brainly.com/question/28065038

#SPJ2

The differentiation of dy/dx is (A) -3.215.

A function's derivative with respect to an independent variable can be used to define differentiation. Calculus differentiates to measure the function per unit change in the independent variable.

To solve the differential equation dy/dx=x*cos(x²), we need to integrate both sides with respect to x.

Integrating the right-hand side involves the substitution u = x², du/dx = 2x, so that cos(x²) dx = (1/2)cos(u) du.

Substituting u = x² and cos(u) = cos(x²) in the integral we have:

dy/dx = x*cos(x²)

=> dy = x*cos(x²)dx

=> ∫ dy = ∫ x*cos(x²)dx

=> y = (1/2) sin(x²) + C

where C is a constant of integration.

To determine the value of C, we use the initial condition y=-3 when x=0:

y = (1/2)sin(x²) + C

=> -3 = (1/2)sin(0) + C

=> C = -3

Using a calculator or a table of values for sine, we have sin(π²) ≈ 0.0247, so:

y = (1/2)sin(π²) - 3

=> y ≈ -2.9876

Therefore, the answer is closest to option A, -3.215.

Learn more about differentiation on:

https://brainly.com/question/954654

#SPJ1

A) y = x + 3 represents a straight line with a slope of 1 passing through the point (0,3).

B) y = -x + 3 represents a straight line with a slope of -1 passing through the point (0,3).

C) y = |x| + 3 represents two lines; one with a slope of 1 passing through the point (-3,0) and another with a slope of -1 passing through the point (3,0).

The points (x,y) that satisfy all three equations must lie on the lines with slope 1 and -1 passing through the point (0,3).

These lines intersect at the point (1,4) and the set of points that satisfy all three equations is the single point (1,4).

Learn more about slope on

https://brainly.com/question/3493733

#SPJ1

Answer:

To convert gallons to liters, we need to multiply the number of gallons by 3.78541, which is the conversion factor.

Capacity in liters = 16 gallons * 3.78541 liters/gallon

Capacity in liters = 60.56 liters (rounded to the nearest tenth)

Therefore, the capacity of the gas tank in liters is approximately 60.6 liters.

Answer:

60.6

Step-by-step explanation:

First, we find how many liters there are in a gallon. We find there are 3.78541178 liters in a gallon. 16*3.78541178 =60.5665885 Rounding to the nearest tenth, we get 60.6 as our answer.

Answer:

224

Step-by-step explanation:

Total marks = x

x * 25% + 64 = x * 40% - 32

x * 15% = 96

x = 640

Maximum Marks = 640..

Marks Scored = 25% of 640

                        = 160
Marks Required to pass = 160 + 64

                                        = 224

To find the linear approximation of f(x) at x = 3, we need to calculate the derivative f'(x) and then use the formula for the linear approximation: L(x) = f(a) + f'(a)(x-a).

Step 1: Calculate the derivative f'(x) of the given function f(x).
As the function is not provided, I'll assume it's a general rational function, f(x) = P(x)/Q(x), where P(x) and Q(x) are polynomials. To find the derivative, use the quotient rule: f'(x) = (P'(x)Q(x) - P(x)Q'(x))/Q(x)^2.

Step 2: Evaluate f(3) and f'(3).
Once you find f'(x), plug in x=3 to get f(3) and f'(3).

Step 3: Use the linear approximation formula.
L(x) = f(3) + f'(3)(x-3).

Now, estimate L(2.9):
L(2.9) = f(3) + f'(3)(2.9-3) = f(3) - 0.1f'(3).

To provide an exact answer in fractional form, compute the numerical values of f(3) and f'(3) and substitute them in the equation above.

To know more about linear approximation click on below link:

https://brainly.com/question/1621850#

#SPJ11

Answer:

67.5%

Step-by-step explanation:

To calculate the percentage decrease in the share price of Bitcoin, we can use the following formula:

Percentage decrease = ((original value - new value) / original value) x 100%

Here, the original value is the share price before the crash, which is $60,000, and the new value is the share price after the crash, which is $19,500.

Substituting these values into the formula, we get:

Percentage decrease = ((60,000 - 19,500) / 60,000) x 100%

= 40,500 / 60,000 x 100%

= 67.5%

Therefore, the percentage decrease in the share price of Bitcoin is 67.5%.

The Cartesian equation of the curve is  Y = 1/X.

To the parameter and find a Cartesian equation of the curve using the given terms. Consider the following:

X = sin(t), Y = csc(t), and 0 ≤ t ≤ 2π

Step 1: Rewrite Y in terms of sin(t)
Since Y = csc(t), we know that csc(t) = 1/sin(t). Therefore, Y = 1/sin(t).

Step 2: Eliminate the parameter t
We already have X = sin(t), so we can substitute this into the equation for Y:
Y = 1/X

Step 3: Write the Cartesian equation of the curve
Now that we have eliminated the parameter t, the Cartesian equation of the curve is simply:

Y = 1/X

Therefore, the Cartesian equation of the curve is Y = 1/X.

Know more about Cartesian equation here:

https://brainly.com/question/14869452

#SPJ11

A particular solution is y_p(t) = -1/2sin(t) + 1/2cos(t), and the general solution is: y(t) = y_h(t) + y_p(t) = c1e^(t/2)cos(√3t/2) + c2e^(t/2)sin(√3t/2) - 1/2sin(t) + 1/2cos(t).

a. For the equation y'' - y' + y = sin(t), the characteristic equation is r^2 - r + 1 = 0, which has complex roots r = (1 ± i√3)/2. Therefore, the homogeneous solution is y_h(t) = c1e^(t/2)cos(√3t/2) + c2e^(t/2)sin(√3t/2).

To find a particular solution, we assume it has the form y_p(t) = Asin(t) + Bcos(t), where A and B are unknown constants. Taking the derivatives, we get y_p'(t) = Acos(t) - Bsin(t) and y_p''(t) = -Asin(t) - Bcos(t). Substituting these into the original equation, we get:

(-Asin(t) - Bcos(t)) - (Acos(t) - Bsin(t)) + Asin(t) + Bcos(t) = sin(t)

Simplifying, we get:

2B = 1

Therefore, B = 1/2. Substituting this into the equation above, we get:

-Acos(t) + 1/2sin(t) + Acos(t) - 1/2sin(t) = sin(t)

Simplifying, we get:

A = -1/2

Therefore, a particular solution is y_p(t) = -1/2sin(t) + 1/2cos(t), and the general solution is:

y(t) = y_h(t) + y_p(t) = c1e^(t/2)cos(√3t/2) + c2e^(t/2)sin(√3t/2) - 1/2sin(t) + 1/2cos(t).

To know more about particular solution refer here:

https://brainly.com/question/20372952#

#SPJ11

The simplified form of the surd is 1 - 1/3√5

Here are the general steps to follow when rationalizing a surd:

Identify the surd in the denominator of the fraction.

Multiply the numerator and denominator of the fraction by the conjugate of the denominator. The conjugate is obtained by changing the sign of the surd term in the denominator.

Simplify the resulting expression by expanding the brackets and collecting like terms.

If there is still a surd in the denominator, repeat the process until no surds remain in the denominator.

Given that;

√2 - √10/√2 + √10

Then;

√2 - √10/ √2 + √10  * √2 - √10/√2 - √10

2 -√20 - √20  + 10/2 -√20 + √20 + 10

2 - 2√20 + 10/2 + 10

12 - 2√20/12

1 - 1/3√5

Learn more about surd:https://brainly.com/question/30069850

#SPJ1

The answer is non-conventional cash flow .

Cash flow refers to the movement of money in and out of a business or individual's financial accounts over a specific period of time. It represents the inflow and outflow of actual cash, as opposed to accounting profit or loss, which may include non-cash items such as depreciation or accruals .

When the algebraic signs on the net cash flows change more than once, the cash flow sequence is called non-conventional cash flow .

Learn more about : Cash flow - https://brainly.com/question/31499701

#SPJ11

The lengths of the legs of the right triangle are given as follows:

2.39 feet and 4.39 feet.

The Pythagorean Theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides.

The theorem is expressed as follows:

c² = a² + b².

In which:

c is the length of the hypotenuse.

a and b are the lengths of the other two sides (the legs) of the right-angled triangle.

The parameters for this problem are given as follows:

Hence the value of x is obtained as follows:

x² + (x + 2)² = 5²

x² + x² + 4x + 4 = 25

2x² + 4x - 21 = 0.

Using a calculator, the positive solution for x is given as follows:

2.39.

Hence the legs are:

2.39 feet and 4.39 feet.

More can be learned about the Pythagorean Theorem at brainly.com/question/30203256

#SPJ1

The volume of the rectangular prism shown is 12 3/4 cubic feet. The correct option is (C).

The volume of a rectangular prism is given by:

V = length x width x height

Given

height (h) = 4 1/4 ft = 17/4

width (w) 1 1/2 ft = 3/2

length (l)  = 2 ft.

Substitute the values:

Volume = length x width x height

= 2 ft x 3/2 ft x 17/4 ft

= 51/4 cubic feet

= 12 3/4 cubic feet

Therefore, the volume of the rectangular prism is 12 3/4 cubic feet.

Learn more about rectangular prism here:

https://brainly.com/question/23963432

#SPJ1

Answer:

78.274 (Steps shown below)

Step-by-step explanation:

Rectangle Area

6 x 12 =50

Circle (put the 2 half circles together)

Circle area = π * r² = π * 9 [inch²] ≈ 28.274 [in²]

π ≈ 3.14159265 ≈ 3.14

d = r * 2 = 3 [inch] * 2 = 6 [inch]

Area of Circle= 28.274

The numerical values of the coefficients A and B are:

A = -1/6
B = 1/6

To perform partial fraction decomposition, we need to break down the fraction into simpler terms.

The form of the partial fraction decomposition of the given function is:

5/(5x - 72) = A/(5x - 66) + B/(5x - 72)

Here, A and B are the coefficients we need to find. We can find them by cross-multiplying and equating the numerators of both sides of the equation:

5 = A(5x - 72) + B(5x - 66)

Now, we can substitute some values of x to get two equations in terms of A and B:

For x = 14:

5 = A(5(14) - 72) + B(5(14) - 66)

Simplifying and solving for A and B, we get:

A = 1/6
B = -1/6

For x = 12:

5 = A(5(12) - 72) + B(5(12) - 66)

Simplifying and solving for A and B again, we get:

A = -1/6
B = 1/6



Generally, for a function f(x) with a rational expression in the integral, we can use partial fraction decomposition to rewrite the expression as a sum of simpler fractions. This makes it easier to find the integral.

The coefficients A and B are constants in the simpler fractions, and their values can be determined by solving a system of linear equations.

Visit here to learn more about Coefficients:

brainly.com/question/27969435

#SPJ11

The above is a logic puzzle. Logic puzzles challenge the mind and enhance critical thinking.

According to the clues given, Jane was seen checking out an action book after leaving either a Biology or History class. It was also determined that Jayson is enrolled in Biology and the student who checked out a fantasy book, Jose, has an English class immediately following Jenny's.

Furthermore, we were able to deduce that the individual who left a History class was the same person who checked out a mystery novel while the student studying French must have been present during 1st period.

Jaden, who is currently enrolled in Algebra class, is observed browsing through a Manga novel. It can be noted that while studying for academic subjects like Math, the temptation to deviate towards leisure reading material can often pose as a distraction.

Learn more Logic Puzzles:
https://brainly.com/question/31149956
#SPJ1

The second derivative of y = 3sin(x) + [tex]x^{2 cosx}[/tex] is [tex]d^{2y}[/tex]/dx^2 = -3sin(x) - x²cos(x) + 2cos(x) - 2xsin(x).

To find the second derivative of y = 3 sin(x) + x² cos(x), we need to take the derivative of the first derivative of y with respect to x.

First, let's find the first derivative of y:

dy/dx = 3cos(x) - [tex]x^{2sin(x)}[/tex] + 2xcos(x)

Now, let's take the derivative of this expression with respect to x to find the second derivative:

[tex]d^{2y}[/tex]/dx² = -3sin(x) - x²cos(x) + 2cos(x) - 2xsin(x)

Therefore, the second derivative of y = 3sin(x) + [tex]x^{2 cosx}[/tex] is [tex]d^{2y}[/tex]/dx^2 = -3sin(x) - x²cos(x) + 2cos(x) - 2xsin(x).

Learn more about second derivative

brainly.com/question/29090070

#SPJ11

The total amount of interest that Minh will need to pay the bank at the end of 5 years is $1,350 whose principal amount is $3,000

The formula for simple interest is:

I = P × r ×  t

Where:

I is the amount of interest

P is the principal amount borrowed

r is the interest rate per year

t is the time period in years

In this case, P = $3,000, r = 9% = 0.09 (as a decimal), and t = 5 years. Substituting these values into the formula, we get:

I = 3000 × 0.09 × 5

I = $1,350

Therefore, the total amount of interest that Minh will need to pay the bank at the end of 5 years is $1,350.

To learn more on Percentage click:

https://brainly.com/question/24159063

#SPJ1

The total amount of interest that Minh will need to pay the bank at the end of 5 years is $1,350 whose principal amount is $3,000

The formula for simple interest is:

I = P × r ×  t

Where:

I is the amount of interest

P is the principal amount borrowed

r is the interest rate per year

t is the time period in years

In this case, P = $3,000, r = 9% = 0.09 (as a decimal), and t = 5 years. Substituting these values into the formula, we get:

I = 3000 × 0.09 × 5

I = $1,350

Therefore, the total amount of interest that Minh will need to pay the bank at the end of 5 years is $1,350.

To learn more on Percentage click:

https://brainly.com/question/24159063

#SPJ1

The expression for the nth term an, for the infinite series s=∑n=1[infinity]an is ∑n=4¹⁶an = 468

We know that the sum of the first n terms of the series is given by sn. Therefore, we can find an expression for the nth term an by taking the difference between successive values of sn:

sn - sn-1 = an

(4-4n²) - (4-4(n-1)²) = an

Simplifying this expression, we get:

an = 8n - 4

Now we can use this expression to find the values of ∑n=1¹⁰an and ∑n=4¹⁶an:

∑n=1¹⁰an = a1 + a2 + ... + a10

= (81 - 4) + (82 - 4) + ... + (8*10 - 4)

= 76

Therefore, ∑n=1¹⁰an = 76.

Similarly,

∑n=4¹⁶an = a4 + a5 + ... + a16

= (84 - 4) + (85 - 4) + ... + (8*16 - 4)

= 468

Therefore, ∑n=4¹⁶an = 468.

Know more about expression here:

https://brainly.com/question/14083225

#SPJ11

The Extreme Value Theorem does not guarantee the existence of an absolute maximum and minimum for f(x) on this interval.

The extreme value theorem states that if a function is continuous over a closed interval, then it must have at least one absolute maximum and one absolute minimum on that interval. In the case of f(x) = cot(x) 10 over the interval [−π,π3], this function is continuous over the interval since it is the composition of two continuous functions (cot(x) and 10). Therefore, the extreme value theorem guarantees that there must be at least one absolute maximum and one absolute minimum for f(x) on this interval.
The Extreme Value Theorem states that if a function is continuous on a closed interval, then it has an absolute maximum and minimum on that interval. The function f(x) = cot(x) is not continuous over the interval [-π, π/3] due to the presence of vertical asymptotes, where the function is undefined. Therefore, the Extreme Value Theorem does not guarantee the existence of an absolute maximum and minimum for f(x) on this interval.

To learn more about Extreme Value Theorem, click here:

brainly.com/question/30760554

#SPJ11

The answer is (D) The limit cannot be determined from the information given.

To start, we need to simplify the given equation:

f(2) = g(2) + h(2)

Substituting 2 into g(x), we get:

g(2) = sin(2π/3 + 2) + 3

Using the unit circle, we can see that sin(2π/3 + 2) = sin(2π/3 - 1) = √3/2 * cos(1) - 1/2 * sin(1)

So, g(2) = √3/2 * cos(1) - 1/2 * sin(1) + 3

Now, substituting 2 into h(z), we get:

h(2) = -2/(2+3)

Simplifying, we get h(2) = -2/5

Therefore, f(2) = g(2) + h(2) = √3/2 * cos(1) - 1/2 * sin(1) + 3 - 2/5

Now, to find the limit as x approaches 3, we need to evaluate:

lim (x→3) f(x)

However, since we only have information for f(2), we cannot determine the limit as x approaches 3.

Therefore, the answer is (D) The limit cannot be determined from the information given.

Learn more about trigonometric functions here: brainly.com/question/6904750

#SPJ11

To sketch the straight-line Bode plot of the gain only for the voltage transfer function T(S) = 20s/ S2 + 58s + 400, we first need to break it down into its constituent parts. The numerator is simply a constant gain of 20, while the denominator can be factored into two second-order terms:

T(S) = 20s/ (S+20)(S+20)

Using the standard Bode plot rules for second-order systems, we can plot each term separately and then combine them to get the overall plot. For each term, we need to find the resonant frequency, damping ratio, and gain at low and high frequencies.

For the first term (S+20), the resonant frequency is 20, the damping ratio is 1/2, and the low-frequency gain is 0 dB. At high frequencies, the gain rolls off at a rate of -20 dB/decade.

For the second term (S+20), the resonant frequency is also 20, the damping ratio is 1/2, and the low-frequency gain is 0 dB. However, at high frequencies, the gain rolls off at a rate of -40 dB/decade due to the double pole.

To combine these two plots, we simply add the gains at each frequency and use the steeper roll-off rate for the second term. The result is a straight-line Bode plot with a gain of 20 dB at low frequencies, a resonant peak at 20 rad/s, and a steep roll-off at high frequencies.

The plot will cross the 0 dB line at two points, one before and one after the resonant peak, due to the double pole in the transfer function.

To know more about bode plot refer here:

https://brainly.com/question/31494988?#

#SPJ11

Thus, the 4th coordinate of the rectangle with the given coordinates is found as : D(8, -5). Area of the rectangle ABCD = 21 sq. units.

The Pythagorean theorem serves as the foundation for the distance formula. A line connecting two sites of interest is the hypotenuse of a right triangle, and this particular line connects the two points of interest.

The neighbouring side is obtained by joining the x-coordinates of a two points in a horizontal line, whereas the opposing side is obtained by joining the y-coordinates.

d=√((x2 - x1)²+(y2 - y1)²)

Given data:

vertices of a rectangle ABCD -

A(5, 2), B(8, 2), C(5, -5)

Let the 4 the vertex be D(x,y).

Plot the coordinates on the graph.

Now, we know that - opposite sides of the rectangle are equal.

Thus,

AB = CD

From graph,D(x,y).

x - (5 + 3) = 8

y - (2 - 7) = -5

Thus, the 4th coordinate of the rectangle with the given coordinates is found as : D(8, -5).

Area of the rectangle ABCD = length x breadth

length = 2 + 5 = 7 units

width = 8 - 5 = 3 units

Area of the rectangle ABCD = 7 x 3

Area of the rectangle ABCD = 21 sq. units.

know more about the distance formula:

https://brainly.com/question/13256731

#SPJ1

For a marketing firm which is considering making up to three new hires.

a) The probability that the firm will make at least one hire is equals to the 0.90.

b) The expected value and the standard deviation of the number of hires are 1.57 and 0.78 respectively.

We have a marketing firm is considering making up to three new hires. Let's consider the a random variable X that represents the hiring of candidates. So, possible values of X = 0, 1, 2,3.. Now, The chances of probability of hiring at least two candidates, P( X ≥ 2) = 60% = 0.60

The chances of probability that hiring of none of them = P( X = 0) = 10% = 0.10

The chances of probability that hiring of all of them = P( X = 3) = 5% = 0.05

We have to determine probability that the firm will make at least one hire, P(X ≥ 1).

By probability law, sum of any possible probability values = 1

=> P( X≥ 1 ) = 1 - P( X = 0)

= 1 - 0.10 = 0.90

b) The expected value, E(X), or we say mean μ of a discrete random variable X, is equals to the sum of resultant of multiply each value of the random variable by its probability. The formula is, E ( X ) = μ = ∑ x P ( x )

So, Probability that hiring of exactly two candidates, P( X= 2). As we know, P( X ≥ 2) = 0.60

=> P ( 3) + P (2) = 0.60

=> P(2) = 0.60 - 0.05 = 0.55

Probability that hiring of exactly one candidates, P( X= 1). From, P( X≥ 1 ) = 0.90

=> P( 1) + P ( 3) + P (2) = 0.90

=> P(1) = 0.30

Hence, excepted value, E(X) = ∑ x P ( x )

= 0 × 0.10 + 1× 0.30 + 2× 0.55 + 3× 0.05

= 1.57

Now, standard deviations, σ =√E(X²) - (E(X))²

E(X²) = ∑ x² P ( x )

= 0² ×0.10 + 1² ×0.30 + 2²× 0.55 + 3²× 0.05

= 3.07

so, the standard deviation of the number of hires = √3.07² - 1.57² = 0.78

Hence, required value is 0.78.

For more information about probability, visit:

https://brainly.com/question/25870256

#SPJ4