A report in 2010 indicates that Americans between the ages of 8 and 18 spend an average

Question:

A report in 2010 indicates that Americans between the ages of 8 and 18 spend an average of μ = 7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets. Assume that the of times is normal with a standard deviation of σ = 2.5 hours and find the following values.
a. What is the probability of selecting an individual who uses electronic devices more than 12 hours a day?
b. What proportion of 8- to 18-year-old Americans spend between = and 10 hours per day using electronic devices? In symbols, p(5 < X < 10) = ?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...