2 years ago

Help ASAP! Need full rule

Mathematics

1 answer:

Ulleksa [173]2 years ago

3 0

I dont know this one sorry

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30 is 60%of what number?

Rom4ik [11]

Answer: 50

Step-by-step explanation:

Step 1: 60% = .60

Step 2: 30 = .60Y

Step 3: Divide both sides of the equation by .30 to isolate the variable Y.

30/.60 = .60/.60Y

50=Y

Therefore, 30 is 60% of 50.

3 0

3 years ago

A random sample of 56 lithium batteries has a mean life of 645 hours with a population standard deviation of 31 hours. Compute t

bearhunter [10]

Answer: A. (636.9, 653.1)

Step-by-step explanation:

Given : Sample size : n=56

Significance level : $\alpha: 1-0.95=0.05$

Critical value : $z_{0.05}=1.96$

Sample mean : $\overline{x}=645\text{ hours}$

Standard deviation : $\sigma= 31\text{ hours}$

The 95% confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=645\pm (1.96)\dfrac{31}{\sqrt{56}}\\\\=645\pm8.1\\\\=(636.9, 653.1)$

Hence, 95% confidence interval for population mean is (636.9, 653.1).

8 0

3 years ago

Please help What is the value of S4 for<br> 2.48<br> 12.48<br> 16<br> 24

Sergeu [11.5K]

Answer:

B, 12.48 is the answer

Step-by-step explanation:

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2 years ago

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Answer according to the picture.

Harlamova29_29 [7]

Its A!
if you plug 4 and -7, the equation works

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3 years ago

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What is the x-coordinate of point A in a triangle with vertexes in A(3,6), B(2,4) and C(-3,3) after undergoing a translation of

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Answer:

Step-by-step explanation:

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3 years ago