2. 外语
  3. 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 ch

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 ch

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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 这道题目没有什么陷阱，是一道普通的概率题。100个beans中取出为red or purple的概率为9/100，那么neither purple no red的概率即为1-9/100=0.91。
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