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Romashka-Z-Leto [24]

2 years ago

15

How old are you now ?

2 answers:

oee [108]2 years ago

7 0

Weird. I’m 35 heheheh

user100 [1]2 years ago

4 0

Answer: 14

Step-by-step explanation:

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WILL GIVE BRAINLIEST

Serhud [2]

Answer:

5-2x=4-2x+4+x=8-x

x=5-8=-3

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2 years ago

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Nastasia [14]

Hey, ok so 1) is A
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2 years ago

Would you rather lose the ability to cry or cry every day for 20 minutes randomly?

AlladinOne [14]

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Lose the ability to cry because i dont cry that much

Step-by-step explanation:

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2 years ago

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Korvikt [17]

Answer:

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2 years ago

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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).

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2 years ago