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Suppose that duration of TV commercials on a given network are normally distributed with an average of 75 seconds, and standard deviation of 20 seconds.

Suppose that duration of TV commercials on a given network are normally distributed with an average of 75 seconds, and standard deviation of 20 seconds. If the network aired 218 new TV commercials in a week, how many of those TV commercials have a duration of less than 60 seconds

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