The average of 12 numbers is 16.4, average of 13 numbers is 12.4 and the average of remaining five numbers is
20.8. Then average of 30 numbers will be:
(A) 16.4 (B) 15.4 (C) 14.4 (D) 17.2 (E) 15.9
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Step-by-step explanation:
the average of 30 numbers = average of 12 n.o+average of 13 n.o + average of 5 n.o /3
16.4+12.4+20.8/3=49.6/3=16.5
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