HELP! Use the Complement Rule : What radio of teenager spend more than 2.4 hours doing homework (Details)?

The time a typical American teenager spends doing homework each week is normally distributed with a mean of 4.2 hours and standard deviation of 0.9 hours. 1 Use the Complement Rule : What radio of teenager spend more than 2.4 hours doing homework? 2 Use the Empirical Rule: What is the probability that a... show more The time a typical American teenager spends doing homework each week is normally distributed with a mean of 4.2 hours and standard deviation of 0.9 hours.

1 Use the Complement Rule : What radio of teenager spend more than 2.4 hours doing homework?

2 Use the Empirical Rule: What is the probability that a randomly selected teenager spends less than 5.1 hours doing homework.
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