alleryStart learning →25 students average 60 marks. Five of them average 70. What is the average of the other 20?
A55
B58.5
C60
D57.5
Answer & Solution
Correct answer: D. 57.5
The class total is 1500 and the five give 350, so the other 20 total 1150, a mean of 57.5.
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