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Mean of 5 observation is 7. if four of t...

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

A

2

B

6

C

8

D

4

Text Solution

Verified by Experts

The correct Answer is:
D
`because7=(6+7+8+10+x_(5))/(5)impliesx_(5)=4`
`becausesigma=(sum(x_(i)-overline(x))^(2))/(5)=(1)/(5)[1+0+1+9+9]=4`
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