a) 122
b) 120
c) 125
d) 121
Answer: c
Explanation:
$$\eqalign{
& {\text{Correct average}} \cr
& = 120 + \left( {\frac{{33 – 13}}{4}} \right) \cr
& = 120 + 5 \cr
& = 125 \cr} $$
Average given is 120.
Difference of 33 and 13 is 20.
That means 20 must be added to total.
Then average of is and so must be added to average, i.e.
Correct average = 120 + 5 = 125
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