The probabilities of airplane shot down for
one shoot: (0.4x0.5x0.3+0.6x0.5x0.3+0.6x0.5x0.7)x0.2=0.072;
two shoots: (0.4x0.5x0.3+0.4x0.5x0.7+0.6x0.5x0.7)x0.6=0.246;
three shoots: 0.4x0.5x0.7x1.0=0.14.
Therefore, the probability of airplane shot down is 0.072+0.246+0.14=0.458.
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只看楼主 我来说两句抢地板one shoot: (0.4x0.5x0.3+0.6x0.5x0.3+0.6x0.5x0.7)x0.2=0.072;
two shoots: (0.4x0.5x0.3+0.4x0.5x0.7+0.6x0.5x0.7)x0.6=0.246;
three shoots: 0.4x0.5x0.7x1.0=0.14.
Therefore, the probability of airplane shot down is 0.072+0.246+0.14=0.458.
[ 本帖最后由 emcp 于 2008-7-3 17:11 编辑 ]
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