A box contains 7 red, 14 yellow, 21 green, 42 blue, and 84 purple marbles. A marble is drawn at random from the box. Find the odds against d

Question

A box contains 7 red, 14 yellow, 21 green, 42 blue, and 84 purple marbles. A marble is drawn at random from the box. Find the odds against drawing a purple or yellow marble.

A. 5 to 7

B. 5 to 12

C. 2 to 7

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Thiên Thanh 6 months 2021-07-20T20:30:52+00:00 1 Answers 0 views 0

Answers ( )

    0
    2021-07-20T20:32:12+00:00

    Answer:

    B

    Step-by-step explanation:

    Here, we are to find the odds against drawing a purple or yellow marble.

    Mathematically, the odds against drawing a particular marble color = 1 – the probability of drawing that particular marble color

    probability of drawing a purple colored marble = number of purple colored marbles/total number of marbles

    = 84/(84 + 42 + 21 + 14 + 7) = 84/168 = 1/2

    So the odds against drawing a purple colored marble = 1 – 1/2 = 1/2

    The odds against drawing a yellow marble color = 1 – probability of drawing a yellow colored marble

    Probability of drawing a yellow colored marble = number of yellow marbles/total number of marbles = 14/168 = 1/12

    So the probability of drawing a yellow colored marble or purple colored marble = 1/12 + 1/2 = 7/12

    Now, the odds against drawing either of the two = 1 – the probability of drawing either of the 2 = 1 -7/12 = 5/12

    or simply put 5 to 12

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