Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 4 - Probability - 4-3 Addition Rule - Basic Skills and Concepts - Page 156: 36

Answer

0.407. Probably the rate in the population is much lower than 0.407.

Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, hence the probability of the subject using marijuana is $\frac{122}{300}=0.407.$ Probably the rate in the population is much lower than 0.407.
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