Question

Given a sample with 5 scores: 4, 6, 8, 10, and y, and the mean of this sample is 6, what is the variance of the sample

Answer 1

8+10+4+6+y /5=6

find lcm which is 5

(8+10+4+6+y/5)5=(6)5

8+10+4+6+y=30

28+y=30

y=30-28

y=2