Posted by **Justina** on Sunday, August 7, 2011 at 7:55pm.

The lifetime of a SuperTough AAA battery is normally distributed with mean of 28.5 hours and standard deviation of 5.3 hours. For a battery selected at random, what is the probability that the lifetime will be 25 hours or less?

a. 0.7454

b. 0.6604

c. 0.2546

d. 0.3396

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