PLEASE HELP ME I WILL MARK YOU AS BRAINLIEST IF RIGHT PLWASEEWE

Answer:

x = 12

Step-by-step explanation:

{22, 14, 12}

2x = 24

2(22) = 44

2(14) = 28

2(12) = 24

c = 1/2, and the pdf is fx(x) = { 1/2 [tex](1-x^{2} )^{-1}[/tex], −1 ≤ x ≤ 1or 0 otherwise and cdf of X is: FX(x) = { 0, x ≤ -1 or -1/2 [tex]tan^{-1}(x/\sqrt{1-x^{2} )}[/tex] + 1/2, -1 < x < 1 or 1 ,x ≥ 1

(a) To find c, we need to integrate the pdf over its support and set the result equal to 1 since the pdf must integrate to 1 over its entire support. Therefore, we have:

1 = ∫c [tex](1-x^{2} )^{-1}[/tex] dx from -1 to 1

Using the substitution u = 1 - [tex]x^{2}[/tex], we have:

1 = c∫ [tex]u^{-1/2}[/tex] dx from 0 to 1

Solving the integral, we get:

1 = 2c

Therefore, c = 1/2, and the pdf is:

fx(x) = {

1/2 [tex](1-x^{2} )^{-1}[/tex] , −1 ≤ x ≤ 1

0 otherwise

To sketch the pdf, we can notice that it is symmetric about x = 0 and that it approaches infinity as x approaches ±1. Therefore, it will have a peak at x = 0 and decrease as we move away from x = 0 in either direction.

(b) To find the cdf of X, we can integrate the pdf from negative infinity to x for each value of x in the support of the pdf. Therefore, we have:

FX(x) = ∫fX(t) dt from -∞ to x

For x ≤ -1, FX(x) = 0, since the pdf is zero for x ≤ -1. For -1 < x < 1, we have:

FX(x) = ∫1/2 [tex](1-t^{2} )^{-1}[/tex] dt from -1 to x

Using the substitution u = [tex]t^{2}[/tex] - 1, we have:

FX(x) = -1/2 ∫[tex](x^{2} -1)^{-1/2}[/tex] du

Solving the integral, we get:

FX(x) =  -1/2 [tex]tan^{-1}(x/\sqrt{1-x^{2} )}[/tex]  + 1/2

For x ≥ 1, we have FX(x) = 1, since the pdf is zero for x ≥ 1. Therefore, the cdf of X is:

FX(x) = {

0 x ≤ -1

-1/2 [tex]tan^{-1}(x/\sqrt{1-x^{2} )}[/tex]  + 1/2 -1 < x < 1

1 x ≥ 1

To sketch the cdf, we can notice that it starts at 0 and increases gradually from x = -1 to x = 1, where it jumps to 1. The cdf is also symmetric about x = 0, similar to the pdf.

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The required answer is E(X) = 1.4

The expected value E(X) for this distribution can be calculated by multiplying each possible value of X by its probability, and then adding up these products. Using the table provided, we have:

E(X) = (0)(0.2) + (1)(0.3) + (2)(0.4) + (3)(0.1) = 0 + 0.3 + 0.8 + 0.3 = 1.4

Therefore, the closest option to our calculated expected value is option A, 1.2. However, none of the given options match exactly with our calculation.

To find the expected value E(X) of the discrete random variable X, we need the probability distribution table for X. However, the table is not provided in the question. Please provide the table with the probabilities for each possible value of X, and I will be happy to help you calculate the expected value E(X).

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To find a 95% confidence interval for the mean surgery time for this procedure, you need to use the following formula:

CI = X-bar ± (t * (s / √n))

where:
- CI is the confidence interval
- X-bar is the sample mean
- t is the t-score, which corresponds to the desired confidence level (95%) and the degrees of freedom (n-1)
- s is the sample standard deviation
- n is the sample size

1. Calculate the sample mean (X-bar), sample standard deviation (s), and sample size (n).
2. Find the appropriate t-score using a t-table or calculator for 95% confidence level and (n-1) degrees of freedom.
3. Plug the values into the formula and calculate the interval.
4. Round the answers to two decimal places.

The 95% confidence interval for the mean surgery time is (lower limit, upper limit). Make sure to provide the specific values for your data in the formula.

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complete question:

find a 95 confidence interval for the mean surgery time for this procedure. what quantities do you need to calculate the 95 confidence interval ?

Answer:

Step-by-step explanation:

The arithmetic mean of 18 and 128 is (18+128)/2 = 73.

The geometric mean of 18 and 128 is the square root of their product: √(18*128) = √(2304) = 48.

So, the difference between the geometric mean and the arithmetic mean is:

48 - 73 = -25.

Therefore, the difference of the geometric mean and the arithmetic mean of 18 and 128 is -25.

If -ve root of G is taken then
                                  G = -48
and diff of G and A will be  -48 - 73 = -121

(a) The ball is 3 feet high when it leaves the child's hand.                      

(b) The maximum height of the ball is 75 feet.

(c) The ball strikes the ground approximately 91.6 feet from the child

(a) To find the height of the ball moving in a projectile motion when it leaves the child's hand, we need to substitute x = 0 into the equation and solve for y:

[tex]y = -1/16(0)^2 + 6(0) + 3[/tex]

y = 3

Therefore, the ball is 3 feet high when it leaves the child's hand.

(b) To find the maximum height of the ball, we need to find the vertex of the parabola defined by the equation. The x-coordinate of the vertex is given by:

x = -b / (2a)

where a = -1/16 and b = 6. Substituting these values, we get:

x = -6 / (2(-1/16)) = 48

The y-coordinate of the vertex is given by:

[tex]y = -1/16(48)^2 + 6(48) + 3 = 75[/tex]

Therefore, the maximum height of the ball is 75 feet.

(c) To find how far from the child the ball strikes the ground, we need to find the value of x when y = 0 (since the ball will be at ground level when its height is 0).

Substituting y = 0 into the equation, we get:

[tex]0 = -1/16x^2 + 6x + 3[/tex]

Multiplying both sides by -16 to eliminate the fraction, we get:

[tex]x^2 - 96x - 48 = 0[/tex]

Using the quadratic formula, we can solve for x:

[tex]x = [96 \ ^+_- \sqrt{(96^2 - 4(-48))}]/2\\x = [96\ ^+_- \sqrt{(9408)}]/2\\x = 48 \ ^+_- \sqrt{(2352)[/tex]

x ≈ 4.4 or x ≈ 91.6

Since the ball is thrown from x = 0, we can discard the negative solution and conclude that the ball strikes the ground approximately 91.6 feet from the child.

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The probability density function f(x) for a uniform random variable X defined over the interval [2, 10] is:
d. None of these choices.

Step 1: Identify the interval limits, a and b.
a = 2, b = 10

Step 2: Calculate the width of the interval.
Width = b - a = 10 - 2 = 8

Step 3: Determine the probability density function for a uniform distribution.
f(x) = 1 / (b - a)

Step 4: Substitute the values of a and b in the formula.
f(x) = 1 / (10 - 2)

Step 5: Simplify the expression.
f(x) = 1 / 8 = 0.125

So, the correct answer is none of these choices (d).

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Answer:

use Pythagorean theorem

Step-by-step explanation:

:)

a^2+b^2=c^2 if equal triangle is right!

Answer:

7. No.  8. Yes.

Step-by-step explanation:

Use the pythagorean theorem.

[tex]a^{2} + b^2 = c^2[/tex]

Where a and b are legs and c is the hypotenuse.

7.

[tex]3^2 + 7^2 \neq \sqrt{57}^2 \\9 + 49 = 58 \neq 57[/tex]

So it isn't a right triangle.

8.

[tex](5\sqrt{5})^2 = 11^2 + 2^2\\(\sqrt{125})^2 = 121 + 4\\125 = 125[/tex]

So this is a right triangle.

We have shown that |2S| = 2|S| for all finite sets S, by induction on the size of S.

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The trigonometric identity [sint + cost]²/sin(t)cos(t) = 2 + csc(t)sec(t).

Trigonometric identities are mathematical equations that contain trigonometric ratios.

Since we have the trigonometric identity

[sint + cost]²/sin(t)cos(t) = 2 + csc(t)sec(t). We want to show that the left-hand-side L.H.S = right-hand-side R.H.S. We proceed as folows

Since we have L.H.S = [sint + cost]²/sin(t)cos(t), so expanding the numerator, we have that

[sint + cost]²/sin(t)cos(t), = [sin²t + 2sintcost + cos²(t)]/sin(t)cos(t)

Using the trigonometric identity sin²t + cos²t = 1, we have that

[sin²t + 2sintcost + cos²(t)]/sin(t)cos(t) =  [sin²t + cos²(t) + 2sintcost]/sin(t)cos(t)

=  [1 + 2sintcost]/sin(t)cos(t)

Dividing through by the denominator sin(t)cos(t) , we have that

[1 + 2sintcost]/sin(t)cos(t) = [1/sin(t)cos(t) + [2sintcost]/sin(t)cos(t)

= 1/sin(t) × `1/cos(t) + 2

= cosec(t)sec(t) + 2  [since cosec(t) = 1/sin(t) and sec(t) = 1/cos(t)]

= 2 +  cosec(t)sec(t)

= R.H.S

Since L.H.S = R.H.S

So, the trigonometric identity [sint + cost]²/sin(t)cos(t) = 2 + csc(t)sec(t).

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The interval would be wider, with more plausible values, and the margin of error would be larger.

What is confidence interval ?

A confidence interval is a statistical range of values that is used to estimate an unknown population parameter, such as the mean or standard deviation of a distribution, based on a sample of data.

a) The confidence interval captures the plausible range of values for the population mean waist circumference of adult women in the United States. More specifically, it is the range of values that is likely to contain the true population mean with 95% confidence.

b) The confidence interval can be expressed as: "We are 95% confident that the true population mean waist circumference of adult women in the United States falls between 99.8 and 102.0 centimeters."

c) The margin of error for this confidence interval can be calculated by taking half the width of the interval. Therefore, the margin of error is (102.0 - 99.8) : 2 = 1.1. Thus, we can express the confidence interval as "The estimate is 100.9 centimeters plus or minus 1.1 centimeters."

d) A 99% confidence interval based on the same data would be larger than the 95% confidence interval. This is because a 99% confidence level requires a wider interval to capture the true population mean with 99% confidence.

Therefore, the interval would be wider, with more plausible values, and the margin of error would be larger.

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Answer:

6. From speed vs. time graphs, we know that in order to find the distance, we need to look at the area covered. Given the rectangular shape below, we know that it would be A=lw so A=60mph(2.5h).

7. A=60mph(2.5h)= 150 miles.

4√5 is the simplified form of  square root of 10 times square root of 8 .

First, The square root of ten is √10

and, the square root of 8 is √8

Now, simplify square root of 10 times square root of 8.

= √10×√8

By radical property (√a×√b=√a×b

So,√10×√8=√(10×8)=√80

=√16×5

=4√5

Thus, 4√5 is the simplified form of  square root of 10 times square root of 8 .

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Answer:

Set your calculator to degree mode.

Please draw the figure to confirm my answer.

[tex] \tan( \alpha ) = \frac{15}{24} [/tex]

[tex] \alpha = {tan}^{ - 1} \frac{5}{8} = 32 \: degrees[/tex]

So the angle of elevation is 32°.

D is the correct answer.

Answer:

Step-by-step explanation:

0.7 cubic kilometers

V= lwh

V=(.5)(2)(.7)

The given equation is rearranged to obtain 9x - 1 - (41 - 5x) = 0. By simplifying and solving the equation, we get x = 3.

To solve this equation, we first simplify it by subtracting what is to the right of the equal sign from both sides of the equation. This gives us 9x - 1 - 41 + 5x = 0, which simplifies to 14x - 42 = 0. We then pull out the like factor of 14 to obtain 14(x - 3) = 0.

Next, we use the zero product property to find the values of x that make the equation true. We know that 14 can never equal 0, so we focus on the expression inside the parentheses. Setting x - 3 equal to 0, we get x = 3.

Therefore, the solution to the given equation is x = 3.

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Complete Question:

Simplify 9x-1=41-5x.

a. The standard equation for an ellipse with center at the origin and major axis horizontal is:

x^2/a^2 + y^2/b^2 = 1

where a is the length of the semi-major axis and b is the length of the semi-minor axis. The eccentricity e is related to a and b by the equation:

e = √(a^2 - b^2)/a

We are given that the eccentricity e is 0.60 and the length of the major axis is 48 inches. Since the major axis is horizontal, a is half of the length of the major axis, so a = 24. We can solve for b using the equation for eccentricity:

0.6 = √(24^2 - b^2)/24

0.6 * 24 = √(24^2 - b^2)

14.4^2 = 24^2 - b^2

b^2 = 24^2 - 14.4^2

b ≈ 16.44

Therefore, the equation of the ellipse is:

x^2/24^2 + y^2/16.44^2 = 1

b. To find the maximum height of the sign, we need to find the length of the semi-minor axis, which is the distance from the center of the ellipse to the top or bottom edge of the sign. We can use the equation for the ellipse to solve for y when x = 0:

0^2/24^2 + y^2/16.44^2 = 1

y^2 = 16.44^2 - 16.44^2 * (0/24)^2

y ≈ 13.26

Therefore, the maximum height of the sign is approximately 26.52 inches (twice the length of the semi-minor axis).

Answer:

$365.00.

Step-by-step explanation:

Answer: both

Step-by-step explanation:

The limit of the sequence an = [(ln(n))²]/(3n) using L'Hôpital's Rule is 0.

We can apply L'Hôpital's Rule to find the limit of the given sequence:

an = [(ln(n))²]/(3n)

Taking the derivative of the numerator and denominator with respect to n:

an = [2 ln(n) * (1/n)] / 3

Simplifying:

an = (2/3) * (ln(n)/n)

Now taking the limit as n approaches infinity:

lim n->∞ an = lim n->∞ (2/3) * (ln(n)/n)

We can again apply L'Hôpital's Rule:

lim n->∞ (2/3) * (ln(n)/n) = lim n->∞ (2/3) * (1/n) = 0

Therefore, the limit of the sequence is 0.

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The answers are as follows

A: [tex]-2.3^{x-1} = a^{2} (r^{x-1} )\\[/tex]

∴[tex]y = a(-2.3)^{x}[/tex]

The constant ratio is [tex]-2,3[/tex] and the y-intercept is [tex](0,a)[/tex].

B: [tex]45.2^{x-1} = a(r^{x-1} )[/tex]

∴[tex]y = a(45.2)^{x}[/tex]

The constant ratio is [tex]45.2[/tex] and the y-intercept is [tex](0,a)[/tex].

C: [tex]1234-0.1^{x-1}[/tex] [tex]= a r^{x-1}[/tex]

∴  [tex]y = a(0.1)^{x} + 1234[/tex]

The constant ratio is [tex]0.1[/tex] and the y-intercept is[tex](0,a +1234)[/tex].

D: [tex]-5(1/2)^{x-1}[/tex] is not a geometric sequence as there is no common ratio between consecutive terms.

The constant term is [tex]-5[/tex] and the y-intercept is [tex](0,-5)[/tex].

An exponential function is a mathematical function in the form [tex]f(x) = a^{x}[/tex], where a is a positive constant called the base, and x is the variable. These functions have a constant ratio between consecutive outputs.

An explicit formula for a geometric sequence as an exponential function, we can write the nth term as[tex]a(r^{n-1})[/tex], where a is the first term and r is the common ratio.

This is equivalent to the general form of an exponential function, [tex]y = ab^{x}[/tex], where a is the initial value and b is the base. The constant ratio between consecutive terms is equal to the base of the exponential function.

Therefore,

A: [tex]-2.3^{x-1} = a^{2} (r^{x-1} )\\[/tex]

∴[tex]y = a(-2.3)^{x}[/tex]

The constant ratio is [tex]-2,3[/tex] and the y-intercept is [tex](0,a)[/tex].

B: [tex]45.2^{x-1} = a(r^{x-1} )[/tex]

∴[tex]y = a(45.2)^{x}[/tex]

The constant ratio is [tex]45.2[/tex] and the y-intercept is [tex](0,a)[/tex].

C: [tex]1234-0.1^{x-1}[/tex] [tex]= a r^{x-1}[/tex]

∴  [tex]y = a(0.1)^{x} + 1234[/tex]

The constant ratio is [tex]0.1[/tex] and the y-intercept is[tex](0,a +1234)[/tex].

D: [tex]-5(1/2)^{x-1}[/tex] is not a geometric sequence as there is no common ratio between consecutive terms.

The constant term is [tex]-5[/tex] and the y-intercept is [tex](0,-5)[/tex].

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The value of x in the quadrilateral is 4.

We are given that;

Four angles of quadrilateral 5x, 102, 4y-12, 3x+8

Now,

The sum of all interior angles of quadrilateral is 360degree

So, 5x + 102 + 4y-12 + 3x+8 = 360

Also opposite angles are equal

5x= 3x+8

2x=8

x=4

Therefore, by the properties of quadrilateral the answer will be 4.

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Expression is not equal to zero, we cannot find a vector field G such that curl G = (xyz, -y⁶z⁵, y⁵z⁶). Therefore, the answer is no.

There is no such G because the divergence of curl G is not equal to zero. The divergence of curl G is given by the scalar triple product identity:

div(curl G) = dot(grad, curl G)

Using this identity and the given components of curl G, we have:

div(curl G) = x(∂/∂x)(-y⁶z⁵) + y(∂/∂y)(y⁵z⁶) + z(∂/∂z)(xyz)
div(curl G) = -6xy⁵z⁵ + 5y⁶z⁵ + xz

Since this expression is not equal to zero, we cannot find a vector field G such that curl G = (xyz, -y⁶z⁵, y⁵z⁶). Therefore, the answer is no.

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The linear differential operator that annihilates [tex]e^{-x} + 2xe^x - x^2e^x is (D - 2)(D - 1)(D + 1).[/tex]

For [tex]1+6x - 2x^3:[/tex]

The first derivative is [tex]6 - 6x^2[/tex], and the second derivative is -12x. Since the second derivative is a constant multiple of the original function, we can use the differential operator D - 2 to annihilate the function:

[tex](D - 2)(1 + 6x - 2x^3) = D(1 + 6x - 2x^3) - 2(1 + 6x - 2x^3)[/tex]

[tex]= (6 - 6x^2) - 2 - 12x + 4x^3 - 2[/tex]

[tex]= 4x^3 - 6x^2 - 12x + 4[/tex]

[tex]For e^{-x} + 2xe^x - x^2e^x:[/tex]

The first derivative is [tex]2e^x - 2xe^x - x^2e^x,[/tex] and the second derivative is [tex]-2e^x + 2xe^x + 2e^x - 2xe^x - 2xe^x - x^2e^x[/tex]. Simplifying, we get:

[tex](D - 2)(D - 1)(D + 1)(e^{-x} + 2xe^x - x^2e^x) = (D - 1)(D + 1)(2e^x - 2xe^x - x^2e^x)[/tex]

[tex]= (D + 1)(2e^x - 4xe^x - 2xe^x + 2x^2e^x - x^2e^x)[/tex]

[tex]= (D + 1)(2e^x - 6xe^x + 2x^2e^x)[/tex]

Therefore, the linear differential operator that annihilates [tex]e^{-x} + 2xe^x - x^2e^x is (D - 2)(D - 1)(D + 1).[/tex]

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If we are given the quantity (p-1)(q-1), we can use it to factor n=pq. This is because of the relationship between Euler's totient function and the prime factors of n.

Specifically, if we know (p-1)(q-1), we can calculate the value of Euler's totient function for n as follows:

φ(n) = (p-1)(q-1)

We can then use this value to find the prime factors of n. One way to do this is to use the fact that for any prime factor p of n, we have:

n = p^k * m, where m is not divisible by p.

Then, we can use Euler's totient function to calculate the value of φ(n) as:

φ(n) = (p-1) * p^(k-1) * φ(m)

By substituting the value we calculated earlier for φ(n), we can solve for p and q:

φ(n) = (p-1)(q-1) = pq - (p+q) + 1

Solving for p and q using the quadratic formula gives:

p = (p+q) / 2 + sqrt((p+q)^2 / 4 - n)
q = (p+q) / 2 - sqrt((p+q)^2 / 4 - n)

Therefore, if we are given the quantity (p-1)(q-1), we can use it to calculate the value of Euler's totient function for n, and then use that to find the prime factors p and q of n.

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The equation that can be used to determine the total amount y that Susan paid is [tex]y=14x+9[/tex]. The Option B is correct.

To calculate the total amount paid by Susan at the supermarket, we need to add the cost of all the items she bought.

From the given information, we know that:

We can use the equation y = $14x + $9, where y represents the total amount paid by Susan and x represents the pounds of meat which can be multiplied.

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If the marginal propensity to consume(mpc) = 4/5 then the government purchases multiplier is 5. Therefore, the answer is (d) 5.

The marginal propensity to consume (MPC) is the fraction of each additional unit of income that is spent on consumption. In other words, it is the change in consumption that results from a one-unit change in income.

The government purchases multiplier is a measure of the impact that changes in government purchases of goods and services have on the overall economy. It is the ratio of the change in the equilibrium level of real GDP to the change in government purchases.

The government purchases multiplier (K) is calculated using the formula:

K = 1 / (1 - MPC)

where MPC represents the marginal propensity to consume.

In this case, the MPC is given as 4/5, so we can substitute this value into the formula:

K = 1 / (1 - 4/5)

= 1 / (1/5)

= 5

Therefore, the government puchases multiplier is 5. Therefore, the answer is (d) 5.

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The thing that I notice about the ratios of the lengths of the intersected segments as you move B and C is that the ratios is altered (changed) as the position of D changes, but the two ratios was one that remain equal to each other.

If triangle and a line goes through two sides of the triangle, the line cuts the sides into littler line sections. When we choose any point on the line, the lengths of the smallest line fragments it makes will change. But, the proportion between the lengths of the littler line portions will continuously remain the same.

For case, in the event that one of the smaller line segments is twice as long as another, at that point this proportion will continuously be 2:1, no matter where we choose the point on the line.

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If n is a vector normal to the tangent plane of the surface F(x,y,z) = 0 at a point, then option (C) the gradient of F is orthogonal to n.

The gradient of F at a point (x₀, y₀, z₀) is defined as the vector (∂F/∂x, ∂F/∂y, ∂F/∂z) evaluated at that point. This gradient vector is perpendicular (or orthogonal) to the level surface of F passing through that point.

The tangent plane to the surface F(x, y, z) = 0 at a point (x₀, y₀, z₀) is defined as the plane that touches the surface at that point and is perpendicular to the normal vector at that point.

Thus, if n is a vector normal to the tangent plane of the surface F(x, y, z) = 0 at a point (x₀, y₀, z₀), then n is perpendicular to the tangent plane. Since the gradient vector of F at the point (x₀, y₀, z₀) is perpendicular to the tangent plane, it is also perpendicular to n.

Therefore, the correct answer is (C) The gradient of F is orthogonal to n.

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