According to the June 2004 Readers Digest article Only in America, the average amount that a 17-year-old
Question:
According to the June 2004 Readers’ Digest article
“Only in America,” the average amount that a 17-year-old spends on his or her high school prom is $638. Assume that the amounts spent are normally distributed with a standard deviation of
$175.
a. Find the probability that the mean cost to attend a high school prom for 36 randomly selected high school 17-year-olds is between
$550 and $700.
b. Find the probability that the mean cost to attend a high school prom for 36 randomly selected high school 17-year-olds is greater than
$750.
c. Do you think the assumption of normality is reasonable? Explain.
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Related Book For
Just The Essentials Of Elementary Statistics
ISBN: 9780495314875
10th Edition
Authors: Robert Johnson, Patricia Kuby
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