Question

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?

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Give your answer to one decimal place.

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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