Question

Assume you obtaind the following exam scores from six students: 97,90,86,93,76, and 86

a. Find the mean for the scores. I got 88 for the mean.
b. Demonstrate that Σ (Χ - X bar) = 0 for these scores.
c. Find the value of Σ (Χ - X bar)² for these scores.

Answer 1

A) The answer is 88
B)I don't know how to do it
3)I don't know 
Sorry I tried

Answer 2

A) 88 is correct
B) I think we are looking for variance which would be 43.6666- other wise I don't really understand what they are asking for.
C) I think this is sum of differences which would be 262.

I don't know if this is what they are asking for however. so I'm not 100% sure if this is correct, sorry.