Question

Mean of 5 observations is 7. If four of these observations are 6, 7, 8, 10 and one is missing then the variance of all the five observations is:
(a) 4
(b) 6
(c) 8
(d) 2

Answer 1

Mean of 5 observations is 7. If four of these observations are 6, 7, 8, 10 and one is missing then the variance of all the five observations is:

(a) 4

(b) 6

(c) 8

(d) 2