Answer to Question #52390 in Statistics and Probability for marie nagata

Question

a survey was conducted to measure the number of hours per week adults in the united states spend on home computers. In the survey, the number of hours were normally distributed, with a mean of 7 hours and a standard deviation of 1 hour. a survey participants is randomly selected.
a). Find the probability that the hours spent on the home computer by the participant are less than 4.5 hours per week,
b). find the probability that the hours spent on the home computer by the participant are more than 9.5 hours per week.