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Probability based on Z score

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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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Solution Summary

Step by step method for computing probability based on Z score is given in the answer.

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