Discussion of Question with ID = 067 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 96 grams. What is the average weight of all the marbles in the box?


104 grams.


105 grams.


103 grams.


102 grams.

Ans: a

The weighted average = ${5 × 144 + 25 × 96}/30$, which equals ${720 + 2400}/30$ = 104.

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