这三个概率统计题怎么计算的?
2个回答
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2、(1-1/2)×(1-7/10)×(1-9/10)
=1/2×3/10×1/10
=3/200
3、(2-2×2%+1-1×3%)÷(2+1)
=(3-7%)÷3
=293/300
4、(1)1/3×1/6+1/3×1/4+1/3×1/3
=1/18+1/12+1/9
=1/4
(2)1/4÷(1/6+1/4+1/3)
=1/4÷3/4
=1/3
=1/2×3/10×1/10
=3/200
3、(2-2×2%+1-1×3%)÷(2+1)
=(3-7%)÷3
=293/300
4、(1)1/3×1/6+1/3×1/4+1/3×1/3
=1/18+1/12+1/9
=1/4
(2)1/4÷(1/6+1/4+1/3)
=1/4÷3/4
=1/3
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