概率论的解答题.要求有解题步骤.最好讲解下解题思路的.要简单易懂.越容易理解越好.
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概率论的解答题.要求有解题步骤.最好讲解下解题思路的.要简单易懂.越容易理解越好.
计算机中心有三台打字机A,B,C程序甲鱼各台打字机的概率依次为0.6,0.3,0.1.打字机发生故障的概率依次为:0.01,0.05,0.04.一程序因打字机发生故障而破坏,求该程序在A,B,C上打字的概率分别是多少?
计算机中心有三台打字机A,B,C程序甲鱼各台打字机的概率依次为0.6,0.3,0.1.打字机发生故障的概率依次为:0.01,0.05,0.04.一程序因打字机发生故障而破坏,求该程序在A,B,C上打字的概率分别是多少?
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一程序因故障而破坏的概率
P(X) = 0.6*0.01 + 0.3*0.05 + 0.1*0.04 = 0.025
在A,B,C上打字发生故障的概率分别为:
P(A) = 0.6*0.01 / 0.025 = 0.24
P(B) = 0.3*0.05 / 0.025 = 0.6
P(C) = 0.1*0.04 / 0.025 = 0.16
P(X) = 0.6*0.01 + 0.3*0.05 + 0.1*0.04 = 0.025
在A,B,C上打字发生故障的概率分别为:
P(A) = 0.6*0.01 / 0.025 = 0.24
P(B) = 0.3*0.05 / 0.025 = 0.6
P(C) = 0.1*0.04 / 0.025 = 0.16