A) 25.1
B) 2.3
C) 1.5
D) 2.5
Correct Answer: D
Solution :
Mean of the combined group are |
\[M=\frac{63\times 27.6+26\times 19.2}{63+26}=25.1\] |
Thus A.M. is decreased by \[27.6-25.1=2.5\] |
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