## Precalculus (10th Edition)

Published by Pearson

# Chapter 13 - Counting and Probability - 13.3 Probability - 13.3 Asses Your Understanding - Page 865: 36

#### Answer

$\dfrac{7}{30}$

#### Work Step by Step

We know that $\text{probability}=\frac{\text{number of favorable outcomes}}{\text{number of all outcomes}}=\frac{n(F)}{n(S)}.$ There are $7$ black marbles so $n(F)=7$ The total number of possible outcomes is $n(S)=5+10+8+7=30$. Therefore, $\text{probability of selecting a black marble}=\dfrac{7}{30}.$

After 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.