2.75 TV Commercials The mean duration of television commercials on a given network is 75 seconds, with a standard deviation of 20 seconds. Assume that durations are approximately normally distributed. a. What is the approximate probability that a commercial will last less than 35 seconds? b. What is the approximate probability that a commercial will last longer than 55 seconds?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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2.75 TV Commercials The mean duration of
television commercials on a given network is 75
seconds, with a standard deviation of 20 seconds.
Assume that durations are approximately normally
distributed.
a. What is the approximate probability that a
commercial will last less than 35 seconds?
b. What is the approximate probability that a
commercial will last longer than 55 seconds?
Transcribed Image Text:2.75 TV Commercials The mean duration of television commercials on a given network is 75 seconds, with a standard deviation of 20 seconds. Assume that durations are approximately normally distributed. a. What is the approximate probability that a commercial will last less than 35 seconds? b. What is the approximate probability that a commercial will last longer than 55 seconds?
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