2 years ago

Just the first one please ss soon as possible

Mathematics

1 answer:

12345 [234]2 years ago

4 0

Answer:

Step-by-step explanation:

zamn

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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

8m + 7 = 5m +16 what is this answer

Sophie [7]

M equals 3.
That's your answer

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3 years ago

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Two sides of a triangle are 6 m and 7 m. The perimeter of the triangle is 23 m. What's the third side?

mixer [17]

23-6=17
17-7=10
The third side is 10m

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4 years ago

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Edgar has a birdbath that holds 2 gallons of water. He only want to fill it 3/4 full. How much water, in gallons, should Edgar p

stepan [7]

Hello!

2 gallons ÷ 4 = 0.50

0.50 × 3 = 1.50

Edgar should put 1.50 gallons of eater in the birdbath.

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3 years ago

Upon your visit to Izzy’s Ice Cream Igloo you want to order a banana split with two different flavors of ice cream. If your choi

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3 years ago