alleryStart learning →Sets of 10, 20 and 30 numbers have averages 5, 8 and 10. What is the average of all 60 numbers?
A8.5
B9
C8
D7.5
Answer & Solution
Correct answer: A. 8.5
The totals are 50 + 160 + 300 = 510, and 510/60 = 8.5.
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