What is the mean rating given a program that evening

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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?

Reference no: EM131370990

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