Useful for Comparing the Size of Each Category with the Whole

Multiple Choice

useful for comparing the size of each category with the whole (ie the proportion of the whole population falling in each category) . A bar graph is more useful for comparing the sizes of different categories with each other. Find the mean of the set of data.
-13, 12, 2, 4, 10, 15, 7, 9

A) 22
B) 10.29
C) 9
D) 8