Elementary Statistics (12th Edition)

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

Chapter 5 - Discrete Probability Distributions - 5-2 Probability Distributions - Basic Skills and Concepts: 22

Answer

a)0.399 b)0.776. c)The result from b) d)No.

Work Step by Step

a) From the table, the probability of getting exactly 1 failing car is is: $P(X=1)=0.399.$ b)From the table, the probability of getting at most 1 failing car is: $P(X\leq1)=P(X=0)+P(X=1)=0.377+0.399=0.776. $ c)The result from b) because it gives us the probability for the range of 0 to 1 whilst a) only gives us the probability of 1. d) 1 is not an unusually high number of failing cars, because 0.776>0.05.
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