The distribution exam grades for a chemistry class is skewed negatively with a mean of = 71.5 and a standard deviation of = 12. Show your work.

	Answer
What is the probability of selecting a random sample ofn = 9 students with an average grade greater than 75?
What is the probability of selecting a random sample ofn = 36 students with an average grade greater than 75?
For a sample ofn= 36 students, what is the probability that the average grade is between 70 and 75?