The average life of a battery is advertised as 80 hours. A quality control check found that

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The average life of a battery is advertised as 80 hours. A quality control check found that the mean life was normally distributed at 80 hours with a standard deviation of 14 hours.
a. Compute the probability of a mean life between 75 and 90 hours.
b. Compute the probability of a mean life less than 75 hours.
c. Compute the probability of a mean life between 55 and 70 hours.

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Muhammad Salman Alvi

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