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2 years ago

Triple a number, x, increased by 1 is between -20 and 10. What are the solutions for x?

1 answer:

3 0

Hello,
$-20 \leq 3x+1 \leq 10\\
\Rightarrow\ -21 \leq 3x \leq 9\\
\Rightarrow\ -7 \leq x \leq 3\\

Sol=[-7\ 3]\ if\ x\ is\ a\ real.
$

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What’s the expression of this in simplest form

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Answer:

3/17

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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.

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For this problem, we have that:

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The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.4 + 2.575\sqrt{\frac{0.4*0.6}{1600}} = 0.4315$

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2 years ago

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Step-by-step explanation:

hope it's help.

see answer attached

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2 years ago

The Office of Student Services at a large western state university maintains information on the study habits of its full-time st

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Answer: The standard error of the mean = 0.5

Step-by-step explanation:

Given : Sample size : n = 144

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$S.E.=\dfrac{\sigma}{\sqrt{n}}$

i.e. $S.E.=\dfrac{6}{\sqrt{144}}=0.5$

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2 years ago