The number of cell phone minutes used by high school, Other Subject

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The number of cell phone minutes used by high school

The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 400 minutes?

a. 0 b. 0.023 c. 0.159 d. 0.977 e. none of the above.

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