The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 12 - Introducing Probability - Apply Your Knowledge - Page 294: 12.18b

Answer

Grade B- corresponds with P(X < 2.7). Hence: P(X < 2.7) = P(X = 0) + P(X = 0.3) + P(X = 0.7) + P(X = 1.0) + P(X = 1.3) + P(X = 1.7) + P(X = 2) + P(X = 2.3) = 0.05 + 0.04 + 0.06 + 0.03 + 0.04 + 0.12 + 0.06 = 0.4

Work Step by Step

As given above
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