2. 职称英语
  3. 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

游客2024-01-12  49
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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