A) 14.5
B) 13
C) 15
D) 13.5
Correct Answer: A
Solution :
The A.M. of 12 observations is 15. \[\Rightarrow \]Sum of 12 observations \[=\text{12}\times \text{15}=\text{18}0\] An observation 20 is removed \[\Rightarrow \] Mean of the remaining observations\[=\frac{180-20}{(12-1)}=\frac{160}{11}=14.5\]
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