Question

mean= 324 standard deviation = 24 determine two values that define the middle of 90% of...

mean= 324
standard deviation = 24
determine two values that define the middle of 90% of battery life time?

Math   Statistics-And-Probability   
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Answer #1

Answer:

90% of the battery lifetime will lie between 284.52 and 363.48

Explanation:

Let the random variable, X = battery lifetime. The random variable, X follows a normal distribution with parameters, mean= 324, and the standard deviation = 24.

The 90% confidence interval limits for the mean battery life is obtained using the following formula,

The z critical value is obtained from the standard normal distribution table for the significance level = 0.01

Now,

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