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 - Page 208: 17


a)0.044 b)0.055 c)result from b) d)No.

Work Step by Step

a) From the table, the probability of getting exactly 8 girls is: $P(X=8)=0.044.$ b)From the table, the probability of getting at least 8 girls is: $P(X\geq8)=P(X=8)+P(X=9)+P(X=10)=0.044+0.01+0.001=0.055.$ c)The result from b) because it gives us the probability for the range of 8 to 10 whilst a) only gives us the probability of 8. d) 8 is not an unusually high number of girls, because 0.055>0.05.
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