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A certain jar contains 100 jelly beans: 50 white, 30 green, 10 yellow, 5 red, 4
A certain jar contains 100 jelly beans: 50 white, 30 green, 10 yellow, 5 red, 4
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2024-01-12
47
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问题
A certain jar contains 100 jelly beans: 50 white, 30 green, 10 yellow, 5 red, 4 purple, and 1 black. If a jelly bean is to be chosen at random, what is the probability that the jelly bean will be neither purple nor red?
选项
A、0.09
B、0.11
C、0.55
D、0.91
E、0.96
答案
D
解析
一个罐子中装有100粒果冻豆:50粒白的,30粒绿的,10粒黄的,5粒红的,4粒紫的,l粒黑的。若从中随机挑出一粒果冻豆,问该粒果冻豆既不是紫色,又不是红色的概率是多大?
解:本题的正确答案是(D)。因为红色有5粒,紫色有4粒,且挑出任一粒的概率相同,所以随机挑出的果冻豆既不是红色又不是紫色的概率为:(100-9)/100=0.91
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