A) 31
B) 32
C) 33
D) 34
Correct Answer: D
Solution :
Given, mean of a, b, c, d, e = 28 \[\Rightarrow \]\[a+b+c+d+e=140\] ?.(i) Mean of \[a,\,c,\,e=24\] \[\Rightarrow \]\[a+c+e=72\] ?.(ii) By substituting (ii) in (i), we get \[b+d+72=140\] \[\Rightarrow \]\[b+d+72=140\] \[\Rightarrow \]\[b+d+140-72\] \[\Rightarrow \]\[b+d=68\] ?.(iii) Mean of b and d \[=\frac{b+d}{2}=\frac{68}{2}=34\] \[\therefore \]Mean of b and d is 34.
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