Answer
149.9
Work Step by Step
Given $\sigma^2=250$, we have $\sigma=15.8$
Using the z=score formula, we have:
$\frac{142-\bar x}{15.8}=-0.5, \bar x=149.9$
$\frac{165-\bar x}{15.8}=0.955, \bar x=149.9$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.