Probability based on z score

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Reference no: EM13102581

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

Reference no: EM13102581

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