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Question 72

The average of 75 scores is 45. The average of the first 50 scores is 42 and that of the last 26 scores is 52. What is the $$50^{th}$$ score?

The average of 75 scores is 45.

Total of first 75 scores = $$45\times75$$ = 3375    Eq.(i)

The average of the first 50 scores is 42.

Total of first 50 scores = $$42\times50$$ = 2100    Eq.(ii)

average of last 26 scores is 52.

total of last 26 scores = $$52\times26$$ = 1352    Eq.(iii)

$$50^{th}$$ score = Eq.(ii)+Eq.(iii)-Eq.(i)

= 2100+1352-3375

= 3452-3375

= 77

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