Answer
0.1587.
Work Step by Step
$z=\frac{value-mean}{standard \ deviation}=\frac{85-100}{15}=-1.$ Using the table, the value belonging to -1: 0.1587.
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.