Ali surveys 100 randomly selected students in his high school and asks how many hours they spent studying last week, rounded to the nearest tenth. The sample mean of the data is 7.7 hours with a margin of error of ±0.8. What is a reasonable estimate for the number of hours a student at Ali’s high school studied last week?

Only table 2 is a function since it is a one to one mapping

A function is a one-to-one mapping of an equation.

Since we have four expressions to determine if they are functions, we notice that

So, only table 2 is a function

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The number line with plotted numbers 0, 1, 2, 3, 4, and 5 is present in above figure. The mixed number would be plotted where the arrow is pointing on the number line is equals to the [tex]2\frac{ 1}{4} [/tex].

A fraction, often called a fraction, is a combination of a number (integer) and a fraction (part of a whole number). So it has two parts. [tex]4 \frac{1}{7} [/tex] is an example of a mixed number. A number line is a horizontal line in which numbers are evenly distributed. It is used to pictorial representation of numbers. We have numbers for plotting on number line and conditions for plotting are

Now, the plotted number line is present in above figure. See the figure carefully. From the figure the mixed number that would plotted on red mark is [tex]2 \frac{1}{4} [/tex].

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The data is consistent with the Mendelian expected ratios at a significance level of alpha=0.10.

We must use the 9:3:3:1 ratio to calculate the expected numbers of each type of offspring in order to determine whether the observed data match the Mendelian expected ratios.

According to the 9:3:3:1 ratio, we would expect:

9/16 (56.25%) of the offspring to have white feathers and a small comb

3/16 (18.75%) of the offspring to have white feathers and a large comb

3/16 (18.75%) of the offspring to have dark feathers and a small comb

1/16 (6.25%) of the offspring to have dark feathers and a large comb

Using these expected proportions, we can calculate the expected number of offspring for each category:

Type Expected number Observed number (Expected - Observed)² / Expected

White feathers,  

small comb 106.875                   111                    0.197

White feathers,  

large comb 35.625                     37                         0.056

Dark feathers,  

small comb 35.625                   34                          0.018

Dark feathers,  

large comb 11.25                   8                         1.433

To calculate the chi-square statistic, we sum the last column:

chi-square = 0.197 + 0.056 + 0.018 + 1.433 = 1.704

For this test, the degrees of freedom are (4-1) = 3. The critical value from a chi-square distribution table is 6.251 with a significance level of alpha=0.10 and degrees of freedom of 3. We are unable to reject the null hypothesis that the observed data are in line with the Mendelian expected ratios because our calculated chi-square value (1.704) is lower than the critical value (6.251).

Therefore, based on the chi-square test, the data is consistent with the Mendelian expected ratios at a significance level of alpha=0.10.

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Answer:

approximately 1,392 grams

Step-by-step explanation:

The decay of a radioactive substance can be modeled using the formula:

N(t) = N0 * (1/2)^(t / T)

where:

N(t) is the amount of the substance remaining after time t,

N0 is the initial amount of the substance,

t is the time for which we want to calculate the remaining amount,

T is the half-life of the substance.

Given that you have 44,544 grams of europium and its half-life is 9 years, we can use the formula to calculate the amount remaining after 45 years.

Plugging in the values:

N0 = 44,544 grams

t = 45 years

T = 9 years

N(45) = 44,544 * (1/2)^(45/9)

Now we can calculate N(45):

N(45) = 44,544 * (1/2)^(5)

Using the exponent rule for fractional exponents:

(1/2)^5 = 1/32

N(45) = 44,544 * 1/32

N(45) = 1,392 grams (rounded to the nearest gram)

So, after 45 years, approximately 1,392 grams of europium will be left.

Answer:

d = 3

Step-by-step explanation:

For the quadratic function,

(a) Standard form: f(x) = (x + 1)^2 - 7

(b) Its graph will be a parabola opening upward

(c) Minimum value: f(x) = -7

(a) To express the quadratic function f(x) = x^2 + 2x - 6 in standard form, we complete the square.

f(x) = (x^2 + 2x) - 6
To complete the square, take half of the linear coefficient (2) and square it: (2/2)^2 = 1.

Now, add and subtract this value inside the parentheses:
f(x) = (x^2 + 2x + 1 - 1) - 6
f(x) = (x + 1)^2 - 7

So, the standard form is f(x) = (x + 1)^2 - 7.

(b) Since the leading coefficient (1) is positive, the graph of this quadratic function opens upward. The vertex is at the point (-1, -7), which is the minimum point. To sketch the graph, plot the vertex and draw a parabola opening upward.

(c) The minimum value of the function is the y-coordinate of the vertex: f(x) = -7.

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Note that the volume of the smaller cone is Vs = 900cm³

We must use the formula for the volume of a cone in this prompt.

V = (1/3) x   π x r ² x h

Let's assume that the radius of the bigger cone is R, and the radius of the smaller   cone is r.

Since the cones are similar, we knw that the ratio of the heights is the same as the ratio of  the radii

8 / 4 = R / r

Simplifying this equation, we can state

2 = R / r

This is also

R = 2r

So substituting into the expression for the bigger cone we say

Vb = (1/3) x π x (2r)² x 8

(1/3) x π x (2r)² x 8= 3600
8.37758040957 x (2r)² = 3600

2r² = 3600/8.37758040957

2r² = 429.718346348

r² = 214.859173174

r = 14.6580753571

So we can now enter tis into the expression for the smaller volume:

Vs = (1/3) x pi x 14.6580753571² x4

Vs = (1/3) x 3.14159265359 x 214.85917317442229252041 x4

Vs = 900cm³

So we are correct to state that the volume of the smaller cone is 900cm³

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Answer: Option D 9(3)^x

Step-by-step explanation:

3^x+2 = 9(3)^x

9= 3^2

whenever there are same 2 numbers in multiplication, there powers are added.

Therefore, 3^2(3^x) = 3^(x+2)

If 5 wholes are divided into pieces that are each [tex]$\frac{1}{4}$[/tex] start fraction, 1, divided by, 4, end fraction of a whole, there are 20 pieces.

In mathematics, a fraction represents a part of a whole or a collection of equal parts. It is a way of representing a number as a ratio of two integers, where the top number is called the numerator and the bottom number is called the denominator.

If 5 wholes are divided into pieces that are each [tex]$\frac{1}{4}$[/tex] of a whole, we can find the total number of pieces by multiplying the number of pieces in one whole by the number of wholes:

Number of pieces in one whole=

[tex]$\frac{1}{\frac{1}{4}} = 4$[/tex]

Number of pieces in 5 wholes = 5 x 4 = 20

Therefore, there are 20 pieces.

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The solution of both intersections shows where the plane intersects the rainbow.

A precise definition of function finds its roots in mathematics, wherein it is a principle that connects an item from one group (also known as the domain) to a definite element within another group (the range or codomain).

Symbolically expressed by varied means like equations, graphs, and tables. The importance of models based on functions can hardly be overstated, since they reveal links between various factors across disciplines such as physics, engineering, economics, and computer science.

Various examples of crucial functions are linear, quadratic, exponential, trigonometric, and logarithmic - all well-known amongst mathematicians worldwide.

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The signal x[n] is:  x[n] = 19 cos((pi/5)n - pi/2).

The numerical values for A, B, and C are:

A = [tex]sqrt(2 * a0^2 - a5^2)[/tex]

B = [tex]2 * pi / N[/tex]

C = [tex]arctan((a5 / sqrt(2 * a0^2 - a5^2)) / tan(5 * pi / N))[/tex]

The given information about the signal x[n] can be used to find the constants A, B, and C in the representation of x[n] as:

x[n] = A cos(Bn + C)

where A, B, and C are constants. We have:

x[n] is a real and even signal with period N=10

The Fourier coefficient a0 is 11

The Fourier coefficient a5 is 5

The energy of x[n] is 50

The numerical values for A, B, and C can be found as follows:

A = [tex]sqrt(2 * a0^2 - a5^2) = sqrt(2 * 11^2 - 5^2)[/tex] = 19

B = [tex]2 * pi / N[/tex] = pi / 5

C = [tex]-arctan(a5 / sqrt(2 * a0^2 - a5^2)) = -arctan(5 / sqrt(2 * 11^2 - 5^2)) = -pi/2[/tex]

Therefore, the signal x[n] can be represented as:

x[n] = 19 cos((pi/5)n - pi/2)

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Step-by-step explanation:

They will pay $ 360    PLUS 20% of 360        (20% is .20 in decimal)

$   360 ( 1 + .20)  

 $  360 ( 1.20) = $ 432

In this case, the third column of matrix A is a linear combination of the first two columns, which makes the matrix singular and not invertible.

A matrix is a rectangular array of numbers or other mathematical objects, such as polynomials or functions, arranged in rows and columns.

Matrices are used to represent linear transformations, systems of linear equations, and other mathematical structures and operations.

To determine if a matrix is invertible or not, we need to calculate its determinant.

The given matrix is:

A = [1 2 0; 3 4 0; 5 6 0]

The determinant of  3x3 matrix is given by -

determinant(A) = a11(a22a33 - a23a32) - a12(a21a33 - a23a31) + a13(a21a32 - a22a31)

where aij is the element in i th row and j th column of the matrix.

By substituting the values from matrix A-

det(A) = 1(40 - 06) - 2(30 - 05) + 0(36 - 45)

det(A) = 0

Since the determinant of A is equal to zero, we can conclude that the matrix A is not invertible.

The matrix can be  invertible if and only if its determinant is nonzero. When the determinant is zero, the matrix is said to be singular, which means that its rows or columns are linearly dependent, and it cannot be inverted.

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Answer: b. $52.00

Step-by-step explanation:

Answer:

In a 30°-60°-90° right triangle, the length of the hypotenuse is twice the length of the shorter leg, and the length of the longer leg is √3 times the length of the shorter leg.

2) DE = 2 × 5 = 10, DF = 5√3

3) MO = 3√3, LM = 3√3√3 = 9

4) LK = 2√6/√3 = 2√2, JK = 2 × 2√2 = 4√2

(a) P-value for z₀=1.88 is 0.0614

(b) P-value for z₀=−1.92 is 0.0548

(c) P-value for  z₀=0.43 is 0.6672

Assuming a two-tailed test with a significance level of α=0.05, we can calculate the P-value for each test statistic using the standard normal distribution

(a) z₀=1.88

P-value = P(Z > 1.88) + P(Z < -1.88)

= 2 × (1 - P(Z < 1.88))

= 2 × (1 - 0.9693)

= 0.0614

(b) z₀=−1.92

P-value = P(Z < -1.92) + P(Z > 1.92)

= 2 × (1 - P(Z < 1.92))

= 2 × (1 - 0.9726)

Do the arithmetic operation

= 0.0548

(c) z₀=0.43

P-value = P(Z > 0.43) + P(Z < -0.43)

= 2 × (1 - P(Z < 0.43))

= 2 × (1 - 0.6664)

= 0.6672

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Not possible since the value of sin(a) must lie between -1 and 1. Therefore, there is no solution for this problem.

We know that:

csc(a) = 3/2

Since csc(a) = 1/sin(a), we can find sin(a) as:

1/sin(a) = 3/2

Cross-multiplying, we get:

2sin(a) = 3

Dividing by 2, we get:

sin(a) = 3/2

This is not possible since the value of sin(a) must lie between -1 and 1. Therefore, there is no solution for this problem.

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The correlation between gestation and longevity is positive and strong.

This means that as gestation increases, longevity also tends to increase. The outlier (elephant) with 645 days of gestation and 40 years of longevity may affect the correlation.

If we remove the outlier, the correlation between gestation and longevity is likely to weaken.

The outlier (elephant) has extreme values for both gestation and longevity, and removing it would lead to a more balanced distribution of data points.

This might result in a weaker but still positive correlation, suggesting that the relationship between gestation and longevity is not as strong as initially observed. In conclusion, the outlier plays a significant role in the observed correlation, and removing it would affect the strength of the relationship.

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The given sequence an=(2n 1)2(5n−1)2 converges or diverges with the same behavior as the sequence (4/25)^n. The option that suits the answer is option c.diverges. With the limit (4/25)

To determine if the sequence converges or diverges, we can use the limit definition of convergence.

First, we can simplify the expression inside the parentheses:

(2n + 1)^2 / (5n - 1)^2 = (4n^2 + 4n + 1) / (25n^2 - 10n + 1)

Then, we can use the fact that for two sequences {a_n} and {b_n}, if a_n / b_n converges to a non-zero constant, then {a_n} and {b_n} have the same convergence behavior.

So, let's take the limit of this new expression:

lim (n → ∞) [(4n^2 + 4n + 1) / (25n^2 - 10n + 1)]

We can use the highest degree terms in the numerator and denominator to simplify:

lim (n → ∞) [(4n^2 / 25n^2)]

This simplifies to:

lim (n → ∞) (4/25)

Since this limit is a non-zero constant, we can conclude that the sequence {an} converges or diverges with the same behavior as the sequence (4/25)^n.

Thus, the answer is (c) diverges.

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An angle is formed between two rays that are joined together at a single point ( vertex). Protractor helps to determine the measure of angle in degrees but with following the some steps of measurement.

An angle is a geometric shape formed when two rays meet at a point. A protractor is a measuring device, usually made of plastic or glass, used to measure angles. Some protractors are simple half disks or full circles. This is a protractor that helps you measure angles in degrees. Method of measuring an angle with the protractor:

So, using the above steps we can determine an angle’s measurement in degrees. For example if you wants to measure angle ∠ABC. Then follow the above steps and place the protactor like in figure 2. After right placement, we can easily measure the angle. Hence, the measure of angle

∠ABC is 40°.

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Answer:

B) 1/3.

Step-by-step explanation:

There are six possible outcomes when rolling a number cube, and two of them are multiples of 3 (3 and 6). Therefore, the theoretical probability of rolling a multiple of 3 on a single roll of a number cube is 2/6, which simplifies to 1/3.

Therefore, the answer is B) 1/3.

Significant figures and include the appropriate units is [tex]r = 1.166 \times 10^{(-10)}[/tex]

Count up all of the bonds. Determine how many bond groups there are between individual atoms. By the total number of bonding groups in the molecule, divide the number of bonds between atoms. X-Ray crystallography is the only reliable method of determining molecule size. This gives you the crystal structure, including the positions of every atom, and you consequently know the size of the molecule. Any substance that can be crystallised can be used in this procedure, even huge molecules like protein and DNA.

spacing between lines [tex]=4.236*10^{10} s^{(-1)}[/tex]

atomic mass of Li = 7.0160 amu

atomic mass of cl = 34.9688

Bond length of molecule

B = h*c*B

[tex]6.626*10^{(-34)} J*S*3*10^{(10)} cm/s*2.118*10^{(10)} 1/cm[/tex]

[tex]B=42.06 \times 10^{(-24)}J[/tex]

Now according to relation

[tex]B=\frac{h^2}{8\pi^2 I}[/tex]

where I is moment of inertia

[tex]I=\frac{h^2}{8\pi^2 B}[/tex]

[tex]=(6.62*10^{(-34)})^2(JS)^2/8*(3.14)^2*(42.06*10^{(-24)})\\\\= 13.20*10^{(-47)}[/tex]

Calculate,

[tex]K=\frac{7.0160*34.968}{7.0160+34.9688} /\frac{10^{(-3)}kg/mol}{6.022*10^{(23)} mol^{(-1)}}[/tex]

[tex]= 0.970*10^{(-26)}kg[/tex]

[tex]I = \mu r^2 \\\\I=\sqrt{\frac{I}{\mu} }[/tex]

[tex]I=\sqrt{\frac{13.20\times 10^{-47 kg\ mx^2}}{0.970\times 10^{-26}kg} }[/tex]

[tex]r=1.166\times 10^{(-10)}[/tex]

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The probabilities to be calculated are as follows:

a. P(T > t 0.2(df))

b. P(T(df))

c. P(-t 0.1(df)(df))

d. P(T < -t 0.21(df))

a. To calculate P(T > t 0.2(df)), we need to find the probability that a Student's t-distribution with an unknown degrees of freedom (df) exceeds the value of t 0.2. Since the degrees of freedom are unknown, we cannot determine the exact value of this probability without knowing the specific distribution being referred to.

b. To calculate P(T(df)), we need to find the probability that a Student's t-distribution with an unknown degrees of freedom (df) falls within the range of values from negative infinity to positive infinity. Since this range covers the entire distribution, the probability is equal to 1.

c. To calculate P(-t 0.1(df)(df)), we need to find the probability that a Student's t-distribution with an unknown degrees of freedom (df) is less than or equal to the negative value of t 0.1. Again, since the degrees of freedom are unknown, we cannot determine the exact value of this probability without knowing the specific distribution being referred to.

d. To calculate P(T < -t 0.21(df)), we need to find the probability that a Student's t-distribution with an unknown degrees of freedom (df) is less than the value of -t 0.21. As mentioned before, without knowing the degrees of freedom, we cannot determine the exact value of this probability.

Therefore, the probabilities cannot be calculated without knowing the specific degrees of freedom and the distribution being referred to..

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y' = (2x - 5)/(x^2 - 5x + 2)

Using the chain rule in this way allows us to differentiate more complicated functions by breaking them down into simpler functions and applying the chain rule appropriately.

In order to use the chain rule, we need to have a function of the form y=f(g(x)), where g(x) is the inner function and f(x) is the outer function.

One possible choice of f(x) and g(x) that would allow us to use the chain rule is:

g(x) = x^2 - 5x + 2
f(u) = ln(u)

Then, we can write:

y = f(g(x)) = ln(x^2 - 5x + 2)

To find y', we need to apply the chain rule:

y' = f'(g(x)) * g'(x) = 1/(x^2 - 5x + 2) * (2x - 5)

Therefore,

y' = (2x - 5)/(x^2 - 5x + 2)

Using the chain rule in this way allows us to differentiate more complicated functions by breaking them down into simpler functions and applying the chain rule appropriately.

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Answer: The probability of Sandra choosing a blue marble is 2/9, the probability of choosing a yellow marble is 5/9, and the probability of choosing a white marble is 2/9.

Step-by-step explanation:

There are a total of 2 + 5 + 2 = 9 marbles in the bag.

The probability of Sandra choosing a blue marble is 2/9 because there are 2 blue marbles out of 9 total marbles.

The probability of Sandra choosing a yellow marble is 5/9 because there are 5 yellow marbles out of 9 total marbles.

The probability of Sandra choosing a white marble is 2/9 because there are 2 white marbles out of 9 total marbles.

The sum of these probabilities is equal to 1, as Sandra must choose one marble and it must be one of the available options:

2/9 + 5/9 + 2/9 = 9/9 = 1

To reduce bias in an estimator, (B) use random sampling and (C) increase the number of items included in the sample. Random sampling ensures that each member of the population has an equal chance of being selected, while increasing the sample size reduces sampling error and increases the representativeness of the sample.

To reduce bias in an estimator, it is important to use random sampling rather than nonrandom sampling. Random sampling ensures that every item in the population has an equal chance of being included in the sample, which helps to eliminate any potential bias. Additionally, increasing the number of items included in the sample can also help to reduce bias by providing a more representative sample. However, decreasing the number of items included in the sample can actually increase bias as it may not accurately represent the population. Therefore, it is important to use random sampling and include a sufficient number of items in the sample to reduce bias in an estimator.

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The acceleration of the particle at S = 40 m is approximately 2[tex]m/s^2[/tex]

To determine the acceleration of the particle when S = 40 m, we need to use the information given in the graph. The graph shows the velocity of the particle as a function of its displacement, S. Recall that acceleration is the rate of change of velocity with respect to time.

We can estimate the acceleration at S = 40 m by finding the slope of the tangent line to the velocity curve at that point.

One way to estimate the slope of the tangent line is to draw a line that is as close as possible to the curve at the point S = 40 m, and then find the slope of that line. We can use a ruler to draw a tangent line that intersects the curve at S = 40 m, as shown in the graph.

We then measure the displacement and velocity of two points on the tangent line, one on either side of S = 40 m. For example, we might choose the points S = 35 m and S = 45 m, and find their corresponding velocities, which are approximately v = 25 m/s and v = 45 m/s, respectively.

The slope of the tangent line is then given by the change in velocity over the change in displacement:

acceleration = (v2 - v1) / (S2 - S1)

Substituting the values we found, we get:

acceleration = (45 m/s - 25 m/s) / (45 m - 35 m) = 2[tex]m/s^2[/tex]

Therefore, the acceleration of the particle at S = 40 m is approximately 2[tex]m/s^2[/tex].

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The probability of the horse not winning the race is 0.875 or 7/8, given that the odds against the horse winning the race were set at 7 to 1.

When the odds against a horse winning a race are set at 7 to 1, it means that for every 7 times the horse loses, it will win once. In other words, the probability of the horse winning is 1/8 or 0.125.

To find the probability of the horse not winning the race, we can subtract the probability of winning from 1. So, the probability of the horse not winning is:

1 - 0.125 = 0.875 or 7/8

This means that there is a 7/8 chance that the horse will lose the race. It is important to note that the odds and probabilities are two different ways of expressing the same information. The odds are a ratio of the probability of winning to the probability of losing, while the probability is simply the chance of an event occurring.

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To construct the exponential function that contains the points (0,-2) and (3,-128), we can use the general form of an exponential function:

y = a * b^x

where y is the function value, x is the input value, b is the base of the exponential function, and a is a constant representing the y-intercept. To find the specific exponential function that contains the two given points, we need to solve for a and b using the given coordinates.

First, we can use the point (0,-2) to find the value of a:

-2 = a * b^0
-2 = a * 1
a = -2

Next, we can use the point (3,-128) to find the value of b:

-128 = -2 * b^3
64 = b^3
b = 4

Now that we know the values of a and b, we can write the exponential function:

y = -2 * 4^x

Therefore, the exponential function that contains the points (0,-2) and (3,-128) is y = -2 * 4^x.

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