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A study indicates that​ 18- to​ 24- year olds spend a mean of 130 minutes watching...

A study indicates that​ 18- to​ 24- year olds spend a mean of 130 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. Complete parts​ (a) through​ (d) below.

a) What is the probability that an​ 18- to​ 24-year-old spends less than 100 minutes watching video on his or her smartphone per​ month?

b) What is the probability that an​ 18- to​ 24-year-old spends between 100 and 150 minutes watching video on his or her smartphone per​ month?

c) What is the probability that an​ 18- to​ 24-year-old spends more than 150 minutes watching video on his or her smartphone per​ month?

d) One percent of all​ 18- to​ 24-year-olds will spend less than how many minutes watching video on his or her smartphone per​ month?

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