There are 5 orange books, 12 black books, and 8 tan books on Mr. Johnsons bookshelf. Calculate the p

Discussion in 'Calculator Requests' started by math_celebrity, Jun 29, 2019.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    There are 5 orange books, 12 black books, and 8 tan books on Mr. Johnsons bookshelf. Calculate the probability of randomly selecting a black book and then a tan book without replacement. Write your answer as a percent.

    P(black book first draw)
    P(black book first draw) = 12 black / (5 orange + 12 black + 8 tan)
    P(black book first draw) = 12 / 25

    P(tan book second draw)
    P(tan book second draw) = 8 tan / (5 orange + 11 black + 8 tan) <-- 11 black because we already drew one black
    P(tan book second draw) = 8 / 24
    Using our fraction reduction calculator, this simplifies to 1/3

    Since each draw is independent, we multiply both probabilities:
    P(black book first draw, tan book second draw) = 12/25 * 1/3
    P(black book first draw, tan book second draw) = 12/75
    P(black book first draw, tan book second draw) = 16%
     

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