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If the sum of the deviations of 50 obser...

If the sum of the deviations of 50 observations from 30 is 50, then the mean of these observations is

A

30

B

51

C

31

D

50

Text Solution

Verified by Experts

The correct Answer is:
C
Given that sum of derivation is 50
`sum_(1=1)^(50)(x_1-30)=50 rArr sum_(1=1)^(50)x_(i)=30xx50+50`
Mean `=(Deltax_(i))/(n)=(sumx_(i))/(50)=(30xx50+50)/(50)=31`
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