Dr. Jamison gives students 90 minutes to complete the final exam for her course. Most students use almost all the time allowed, and relatively few students finish early, so the distribution of times that it takes students to finish the exam is strongly skewed to the left. The mean and standard deviation of the finishing times are 85 and10minutes, respectively.
Suppose we took random samples of 40 students and calculated x as the sample mean finishing time. We can assume that the students in each sample are independent.
What would be the shape of the sampling distribution of x? Please select one option and then briefly explain:

a) Skewed to the left
b) Skewed to the right
c) Approximately normal
d) Unknown; we don't have enough information to determine the shape.