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?

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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Program 20/20 CSI Law and Order Network ABC CBS NBC Rating 13.8 10.4 7.5 Proportion 0.44 0.33 0.23