Please use the following prompt to answer questions 8a and 8b:

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

8a. What is the probability of selecting an individual who uses electronic devices more than 12 hours a day (MUST SHOW WORK FOR THIS PROBLEM)?

Note: Bring your answer out to the second decimal place.

8b.What proportion of8to18year-old Americans spend between5and10hours per day using electronic devices(MUST SHOW WORK FOR THIS PROBLEM)?

Hint:In symbols,p(5<X<10)=?

Note:Bring your answer out to the second decimal place.