5. Computing the mean from a frequency distribution table

You are a physician who is interested in the role of traumatic life events in overall physical health. You ask a sample of your patients to report the number of traumatic events they experienced as children to see whether the number of childhood traumatic events correlates with the frequency of illness. The sample scores for the number of childhood traumatic events are organized into the following frequency distribution table.

X	f	fX
Number of Traumatic Events	Number of Patients	Total Traumatic Events
0	2	0
1	5	5
2	6	12
3	8	24
4	5	20
5	4	20
6	3	18
7	2	14

Calculate n, X, and M. (Note:X denotes the sum of all scores across the entire sample, not the sum of the column labeled X.)

n	=
X	=
M	=

You decide to add your five newest patients to the study. Two have experienced four childhood traumatic events, and the other three have experienced five childhood traumatic events each.

Calculate the new n, X, and M.

n	=
X	=
M	=