Make up a set of 18 data (think of them as exam scores) so that the sample meets each of these sets of criteria:

a. Mean is 75, and standard deviation is 10.

b. Mean is 75, maximum is 98, minimum is 40, and standard deviation is 10.

c. Mean is 75, maximum is 98, minimum is 40, and standard deviation is 15.

d. How are the data in the sample for part b different from those in part c?