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The ratings of viewership for the three major networks during prime time recently were as follows. Also shown is the proportion of viewers watching each program.
Program
Network
Rating
Proportion
20/20
ABC
13.8
0.44
CSI
CBS
10.4
0.33
Law and Order
NBC
7.5
0.23
a. What is the mean rating given a program that evening?
b. How many standard deviations above or below the mean is the rating for each one of the programs?
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