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3 years ago

8

18 is what percent of 60

2 answers:

Olin [163]3 years ago

7 0

To find the answer, you use the percent proportion.
18 x
— —
60 100

To solve, you do 18 x 100 and get 1800. Then do 1800 <span>÷ 60 and you get 30

***Note to moderators - I copied and pasted the division symbol because I have no idea how to do it on a MacBook***</span>

Arisa [49]3 years ago

5 0

<span>first you set up a proportion 18 over ? = 60 over 100 then cross multiply. 18*100=1800 then divide that by 60 and you get 30 :)</span>

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Pachacha [2.7K]

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Step-by-step explanation:

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inessss [21]

Answer:

The 95% confidence interval is $295.9 < \mu< 324.1$

A 95% level of confidence mean that there is 95% chance that the true population mean will be in this interval

Step-by-step explanation:

From the question we are told that

The sample size is $n = 25$

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The standard deviation is $\sigma = 36 \ mg$

Given that the confidence level is 95% then the level of significance is mathematically represented as

$\alpha = 100 - 95$

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=> $\alpha = 0.05$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table , the value is

$Z_{\frac{\alpha }{2} } =Z_{\frac{0.05 }{2} } = 1.96$

Generally the margin of error is mathematically represented as

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substituting values

$E = 1.96 * \frac{36 }{\sqrt{25} }$

$E = 14.1$

The 95% level of confidence interval is mathematically represented as

$\= x - E < \mu$

substituting values

$310- 14.1 < \mu< 310+ 14.1$

$295.9 < \mu< 324.1$

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