6. The scores on an exam in a class are as follows: 15, 86, 87, 88, 89, 90, 92, 94, 95, and 95

a. Find the mean test score and briefly explain how you found it.

b. Find the median test score. Justify.

c. Find Q1 and Q3. Justify.

d. Make a box-and-whisker plot of the data.

e. Which is a better measure of the center, the mean or the median? Justify.