Question

2.Suppose the life of a particular brand of calculator battery is approximately normally distributed with a...

2.Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 9 hours. Complete parts a through c.

a. What is the probability that a single battery randomly selected from the population will have a life between 65 and 85​hours?

​P(65≤ overbar x≤85​)=

(Round to four decimal places as​ needed.)

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Answer #1

Sol: The above question is based on the probablity distribution of Z score.

Z- score shows the value away from mean value. here the range is: 85-65

Mean value= 75 hours and standard deviation = 9.

z(score 65)= 65-75/9= -1.11

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