A report in 2010 indicates that Americans between the ages of 8 and 18 spend an average of, mean u = 7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets....

A report in 2010 indicates that Americans between the ages of 8 and 18 spend an average of, mean u = 7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets. Assume that the distribution of times is normal with a standard deviation of sigma= 2.5 hours.

(A) what is the probability of selecting an individual who uses electronic devices more than 12 hours a day?

(B) what proportion of 8-18 year old Americans spend between 5 and 10 hours per day using electronic devices? In symbols p(5<><>