Discussion of Question with ID = 032 under Averages

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A box contains 5 marbles each having a weight of 144 grams. The box also contains 25 marbles each having a weight of 114 grams. What is the average weight of all the marbles in the box?


119 grams.


120 grams.


118 grams.


117 grams.

Ans: a

The weighted average = ${5 × 144 + 25 × 114}/30$, which equals ${720 + 2850}/30$ = 119.

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