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1.  A national study finds that a US adult spends an average of 48 minutes a day...

1.  A national study finds that a US adult spends an average of 48 minutes a day on the phone with a standard deviation of 9 minutes.  This data is normally distributed.

a)  Find the probability that a randomly selected US adult spends more than 60 minutes on the phone a day.

b)  Find the probability that a randomly selected US adult spends between 32 and 40 minutes on the phone each day.

Zina includes her answer below.  What went wrong?

P(z < -.89) = .1867

math   Statistics-And-Probability   
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