A box contains 5 plain pencils and 3 pens. A second box contains 2 color pencils and 2 crayons . One

Discussion in 'Calculator Requests' started by math_celebrity, Apr 19, 2020.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    A box contains 5 plain pencils and 3 pens. A second box contains 2 color pencils and 2 crayons. One item from each box is chosen at random. What is the probability that a plain pencil from the first box and a color pencil from the second box are selected

    Calculate the probability of a plain pencil in the first box:
    P(plain pencil in the first box) = Total Pencils / Total Objects
    P(plain pencil in the first box) = 5 pencils / (5 pencils + 3 pens)
    P(plain pencil in the first box) = 5/8

    Calculate the probability of a color pencil in the first box:
    P(color in the second box) = Total Pencils / Total Objects
    P(color in the second box) = 2 pencils / (2 pencils + 2 crayons)
    P(color in the second box) = 2/4

    We can simplify this. Type 2/4 into our search engine and we get 1/2

    Now the problem asks for the probability that a plain pencil from the first box and a color pencil from the second box are selected.

    Since each event is independent, we multiply them together to get our answer:
    P(plain pencil in the first box, color in the second box) = P(plain pencil in the first box) * P(color in the second box)
    P(plain pencil in the first box, color in the second box) = 5/8 * 1/2
    P(plain pencil in the first box, color in the second box) = 5/16
     

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