Discussion of Question with ID = 061 under Averages

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Question

A box contains 5 marbles each having a weight of 66 grams. The box also contains 25 marbles each having a weight of 96 grams. What is the average weight of all the marbles in the box?

A

91 grams.

B

92 grams.

C

90 grams.

D

89 grams.

Soln.
Ans: a

The weighted average = ${5 × 66 + 25 × 96}/30$, which equals ${330 + 2400}/30$ = 91.


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