Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 12 - Counting and Probability - Section 12.3 Probability - 12.3 Assess Your Understanding - Page 885: 36

Answer

$\dfrac{7}{30}$

Work Step by Step

We know that probability$=\frac{\text{number of favourable outcomes}}{\text{number of all outcomes}}.$ Since there are $7$ black marbles and $5 + 10 + 8 + 7 = 30$ marbles in total, then $P(\text{black marble})=\dfrac{7}{30}$
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