A grading scale is set up for 1000 students’ test scores. It is assumed that the scores are normally distributed with a mean score of 75 and a standard deviation of 15 a) How many students will have...

A grading scale is set up for 1000 students’ test scores. It is assumed that the scores are normally distributed with a mean score of 75 and a standard deviation of 15
a) How many students will have scores between 50 and 70?
b) If 84.1% of students pass the test, what was the minimum passing score?