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12 August, 01:40

A box contains 720 marbles. The result of 20 marbles pulled at random from the box is given below. • 5 red marbles • 6 blue marbles • 3 green marbles • 4 black marbles • 2 yellow marbles Based on this information, how many yellow marbles could be expected in the box? A) 64 B) 72 C) 88 D) 100

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  1. 12 August, 02:17
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    20 is the size of a random sample of 720 marbles.

    Notice that 720=20*36

    If there are 2 yellow marbles in the sample of 20 marbles, then we can expect:

    2*36=72 yellow marbles in the box of 720 marbles

    So, B) 72 is the correct answer
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