Arandom sample of 56 lithium batteries has a mean life of 645 hours with a population standard deviation of 31 hours. compute the 95% confidence interval for mu. a. (636.9, 653.1) b. (712.0, 768.0) c. (539.6, 551.2) d. (112.0, 118.9)

A. (636.9, 653.1)

Step-by-step explanation:

Given : Sample size : n=56

Significance level :

Critical value :

Sample mean :

Standard deviation :

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

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

the solution is h=10 because you add 9 to each side of the equation.

$30.32

step-by-step explanation:

65.00*.12=2.80

65.00-2.80=57.20

57.20*1.06=60.632

60.632/2=30.316