甲、乙隊(duì)各有3名柔道選手,代號(hào)分別為甲1、甲2、甲3和乙1、乙2、乙3,兩隊(duì)隊(duì)員之間甲隊(duì)隊(duì)員獲勝的概率如下表所示.

1

乙­­2

3

1

0.4

0.6

0.8

2

0.2

0.4

0.6

3

0.1

0.4

0.5

(1)若兩隊(duì)之間進(jìn)行對(duì)抗賽,一隊(duì)中至少有兩名選手戰(zhàn)勝對(duì)方才算是此隊(duì)獲勝,那么按甲1對(duì)乙2,甲2對(duì)乙1,甲3對(duì)乙3的人員安排進(jìn)行比賽,甲隊(duì)獲勝的概率是多少?

(2)按(1)的人員安排不變, 重復(fù)進(jìn)行三場(chǎng)比賽,甲隊(duì)至少勝兩場(chǎng)的概率?

(1)P=0.6×0.2×0.5+0.6×.02×0.5+0.6×0.8×0.5+0.4×0.2×0.5=0.4

(2)

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甲、乙隊(duì)各有3名柔道選手,代號(hào)分別為甲1、甲2、甲3和乙1、乙2、乙3,兩隊(duì)隊(duì)員之間甲隊(duì)隊(duì)員獲勝的概率如下表所示.
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