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  • There are 5 yellow marbles ,1 purple marble ,3 green marbles ,and 3 red marbles in a bag .Once a marble is drawn ,it is

    There are 5 yellow marbles ,1 purple marble ,3 green marbles ,and 3 red marbles in a bag .Once a marble is drawn ,it is replaced .Find the probability of each outcome.
    1.A purple then a red marble 2.Tow green marbles in a row
    3.a purple then a green marble
    英語(yǔ)人氣:906 ℃時(shí)間:2020-06-07 18:53:33
    優(yōu)質(zhì)解答
    total marbles:5+3+3+1=12
    replaced 這指的是放回原處
    1.明顯,the p of 1 purple marble= 1/12
    the p of 1 red marble= 3/12
    they're independent.P=P1*P2=1/12 * 3/12 =1/48
    2.the p of 1 GREEN marble= 3/12
    the p of 1 GREEN marble= 3/12
    they're independent.P=P1*P2=3/12 * 3/12 =1/16
    3.the p of 1 purple marble= 1/12
    the p of 1 GREEN marble= 3/12
    they're independent event.P=P1*P2=1/12 * 3/12 =1/48
    應(yīng)該是這樣吧·
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