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3 years ago

15

Absurd answers won't be tolerated They're about 50 students in a class that took a test. 21 of those students passed. If 13

students made a F, find the percent of 50 to 21. Explain.

1 answer:

xxTIMURxx [149]3 years ago

4 0

Answer: About 10.5 passed.

Step-by-step explanation:

1. Convert 50% into a decimal.

First, convert 50% into a fraction, which is 1/2.

Divide 1/2 by its numerator and denominator.

1 / 2 = 0.5

Hence, the answer is 0.5.

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Of the population of all fruit flies we wish to give a 90% confidence interval for the fraction which possess a gene which gives

maks197457 [2]

Answer:

The margin of error for the 90% confidence interval is of 0.038.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

To this end we have obtained a random sample of 400 fruit flies. We find that 280 of the flies in the sample possess the gene.

This means that $n = 400, \pi = \frac{280}{400} = 0.7$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

Give the margin of error for the 90% confidence interval.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$M = 1.645\sqrt{\frac{0.7*0.3}{400}}$

$M = 0.038$

The margin of error for the 90% confidence interval is of 0.038.

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3 years ago

Given the domain (-4, 0,5), what is the range for the relation y = -2x +

mote1985 [20]

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$y =f(x) = - 2x + 4$

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$f( - 4) = - 2( - 4) + 4$

$f( - 4) = 8 + 4$

$f( - 4) = 12$

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$f(0) = - 2(0) + 4$

$f(0) = 0 + 4$

$f(0) = 4$

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$f(5) = - 2(5) + 4$

$f(5) = - 10 + 4$

$f(5) = - 6$

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Range = { 12 , 4 , -6 }

Thus the correct answer is (( A )) .

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Answer:

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