Could use a little help making sure I am on the right track and finding the answers for D & E

A study discovered that Americans watch an average of 23.4 hours of television per week. Assume that the amount of weekly television watching follows the normal distribution with a standard deviation of 7.4 hours. Complete parts (a) through (e) below. a) What is the probability that an American will watch less than 15 hours of television next week? 0.1282 (Round to four decimal places as needed.) b) What is the probability that an American will watch more than 33 hours of television next week? 0.0973 (Round to four decimal places as needed.) c) What is the probability that an American will watch between 16 and 24 hours of television next week? 0.3737 (Round to four decimal places as needed.) d) What is the probability that an American will watch exactly 34 hours of television next week? (Round to four decimal places as needed.) e) What is the weekly amount of telelvision watching that represents the 80th percentile? The 80th percentile is represented by the weekly watching of television of ] hours. (Type an integer or decimal rounded to one decimal place as needed.)