a) 52
b) 57
c) 58
d) 62
Answer: d
Explanation: Let the mean marks of the third group be x.
$$\eqalign{
& \frac{{25 \times 60 + 50 \times 55 + 25 \times x}}{{25 + 50 + 25}} = 58 \cr
& 1500 + 2750 + 25x = 5800 \cr
& 25x = 1550 \cr
& x = 62 \cr} $$
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