Card 7 / 11: If the mean number of doughnut holes consumed by each customer is 6.5, with a standard deviation of 2.5, and if we assume that the number of doughnut holes eaten follows a normal distribution, we would expect 68% of customers to have eaten how many doughnut holes?
A) 4 to 9
B) 2.5 to 11.5
C) 1 to 14
D) 6.5 to 15
E) Cannot be determined from the information given. You need to know the sample size.

Keyboard Shortcuts