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3 years ago

How to this problem -6a<9+3y>6

Mathematics

1 answer:

marusya05 [52]3 years ago

8 0

‍♂️USF’s sunbshdi day is

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5 positive integers are arranged in ascending order, as follows:

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Mark brainliest please

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3 years ago

A jar contains 3 black marbles, 4 white marbles and 5 striped marbles. If a marble is picked at random, what is the probability

lana66690 [7]

Answer:

1/4

Step-by-step explanation:

there is 3 black marbles and 3+4+5=12 total marbles. 3/12=1/4

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3 years ago

Tom always keeps his 4 gardens clean. He takes 20 minutes to clean a single garden. How much time will it take to clean all 4 ga

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1 hour and 20 minutes.

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3 years ago

Sat scores. sat scores of students at an ivy league college are distributed with a standard deviation of 250 points. two statist

erik [133]

The confidence interval for confidence level of $1-\alpha$ is

$\left(\overline x-Z_{\alpha/2}\dfrac\sigma{\sqrt n},\overline x+Z_{\alpha/2}\dfrac\sigma{\sqrt n}\right)$

where $\overline x$ is the sample mean, $Z_{\alpha/2}$ is the critical value for the given confidence level, $\sigma$ is the standard deviation of the population, and $n$ is the sample size. The margin of error is the $Z_{\alpha/2}\dfrac\sigma{\sqrt n}$ term.

a) For a confidence level of $1-\alpha=0.90$ , we have $Z_{\alpha/2}=Z_{0.05}\approx1.64$ . So in order to have a margin of error of at most 25 points, we have

$1.64\dfrac{250}{\sqrt n}=25\implies n\approx268.96$

so Raina should collect a sample of at least 269 students.

b) A confidence interval with a higher confidence level would more closely approximate and reflect the population, so it stands to reason that Luke should collect a larger sample than Raina to meet his 99% confidence spec.

c) For a confidence level of $1-\alpha=0.99$ , we have $Z_{\alpha/2}=Z_{0.005}\approx2.58$ . Then the margin of error would at most satisfy

$2.58\dfrac{250}{\sqrt n}=25\implies n\approx665.64$

so that Luke should collect a sample of at least 666 students.

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3 years ago

The given lengths are two sides of a right triangle. All three side lengths of the triangle are integers and together form a pyt

Alla [95]

The given lengths are two sides of a right triangle. All three side lengths of the triangle are integers, and together they form a Pythagorean triple. Find the length

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3 years ago

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