this is a Probability & Statistics worksheet

For questions 7 7. A set of 125 golf scores are normally distributed with a mean of 76 and a standard de the questions n) What percent of the scores are between 57 b) What is the probability that a score is no more than 797 c) About how many scores fell between one standard deviation of the mean? 8. The talk-time battery life of a group of cell phones is normally disributed with a mean of 5 a) What percent of the phones have a battery hours and a standard deviation of 15 minutes. life of at least 4 hours and 45 minutes? b) What percent of the phones have a battery life between 4.5 hours and 5.25 hours? c) What percent of the phones have a battery life less than 5 hours or greater than 5.5 hours? The number of hours that the employees at the grocery store worked last week is normally distributed with a mean of 24 and a standard deviation of 6. If there are 60 total employees, approximately how many worked at least 30 hours last week? The grade point average (GPA) of the students at Lakeview High School Is normally distributed with a mean of 3.1 and a standard deviation of 0.3. If there are 1800 students enrolled at the school, approximately how many have a GPA between 2.5 and 3.7