8. A television station sells advertising in 15-, 30-, 60-, 90-, and 120-second blocks. The distribution of sales for one 24-hour day is given. Length (in seconds) Probability 15 0.134 30 0.786 60 0.053 90 0.006 120 0.021

MATLAB: An Introduction with Applications
6th Edition
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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I don't know how to resolve the excercise number 8 in the picture.

x
Ullolled in a given semester at a university.
1
P(x) 30
80
2
7/7/15 1/0 끓
driable x represents the number of classes in which a student is
Cell phones 0
Probability
probability distribution, and (b) interpret the results.
In Exercises 7 and 8, (a) find the mean, variance, and standard deviation of the
7. The number of cell phones per household in a small town
3
4 5
6
7 8
10 12/25 %/10 3/20 12/13 12/0
0.02
Length (in seconds)
Probability
2
3
5
6
1
0.020 0.140 0.272 0.292 0.168 0.076 0.032
15
8. A television station sells advertising in 15-, 30-, 60-, 90-, and 120-second
blocks. The distribution of sales for one 24-hour day is given.
0.134
4
30
60
0.786 0.053
90
0.006
120
0.021
Transcribed Image Text:x Ullolled in a given semester at a university. 1 P(x) 30 80 2 7/7/15 1/0 끓 driable x represents the number of classes in which a student is Cell phones 0 Probability probability distribution, and (b) interpret the results. In Exercises 7 and 8, (a) find the mean, variance, and standard deviation of the 7. The number of cell phones per household in a small town 3 4 5 6 7 8 10 12/25 %/10 3/20 12/13 12/0 0.02 Length (in seconds) Probability 2 3 5 6 1 0.020 0.140 0.272 0.292 0.168 0.076 0.032 15 8. A television station sells advertising in 15-, 30-, 60-, 90-, and 120-second blocks. The distribution of sales for one 24-hour day is given. 0.134 4 30 60 0.786 0.053 90 0.006 120 0.021
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