A) 84.0
B) 84.2
C) 84.4
D) This cannot be calculated with the given data
Correct Answer: C
Solution :
[c] Let the number of students of school I = x \[\therefore \] Number of students of school II=1.5 x As given: Mean of marks for school \[I=82\] and mean of marks for school II = 86 \[\therefore \] Combined mean =\[\frac{x\times 82+1.5x\times 86}{x+1.5x}\] \[=\frac{x(82+129)}{2.5x}=\frac{211}{2.5}=84.4\]You need to login to perform this action.
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