#### Answer

0.821

#### Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$. Therefore $probability=\frac{239}{291}≈0.821$. Therefore this suggests that the method was effective.

Published by
Pearson

ISBN 10:
0321836960

ISBN 13:
978-0-32183-696-0

0.821

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