A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.4 years, and standard deviation of 3.8 years.If 23 items are picked at random, 4% of the time their mean life will be less than how many years?Inverse Normal CalculatorGive your answer to one decimal place.

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Asked Oct 28, 2019
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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.4 years, and standard deviation of 3.8 years.

If 23 items are picked at random, 4% of the time their mean life will be less than how many years?

Inverse Normal Calculator

Give your answer to one decimal place.

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Expert Answer

Step 1

Given information:

Mean, µ=14.4

Standard deviation, σ=3.8

Sample size, n=23

Step 2

Computation of mean and standard deviation:

The mean and standard deviat...

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- 14.4 3.8 23 = 0.7926

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