甲乙两人投篮,每次投篮的命中率分别为1/2和2/3,每人投两次.

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  • ⑴1/2×1/2+1/3×2/3×2=25/36

    ⑵同得0分的概率为1/2×1/2×1/3×1/3=1/36,同得2分的概率1/2×1/2×2×2/3×1/3×2=1/18,同得4分的概率为1/2×1/2×2/3×2/3=1/9所以得分相同的概率为1/36+1/18+1/9=7/36