Question

In her first year of university, Mary recieved the following grades:
10, 9, 10, 8, 7, 10

Similarly in his first year, Bob recieved the following grades:
10, 9, 9, 6, 6, 6

(a)	Compute the population mean and variance for Mary's grades.

(b)	Compute the population mean and variance for Bob's grades.

Answer 1

10	1	1
9	0	0
10	1	1
8	-1	1
7	-2	4
10	1	1

10	2.33	5.4289
9	1.33	1.7689
9	1.33	1.7689
6	-1.67	2.7889
6	-1.67	2.7889
6	-1.67	2.7889