Discussion of Question with ID = 003 under Averages

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Question

A box contains 5 marbles each having a weight of 108 grams. The box also contains 25 marbles each having a weight of 72 grams. What is the average weight of all the marbles in the box?

A

78 grams.

B

79 grams.

C

77 grams.

D

76 grams.

Soln.
Ans: a

The weighted average = ${5 × 108 + 25 × 72}/30$, which equals ${540 + 1800}/30$ = 78.


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