2. 职称英语
  3. A certain jar contains 60 jelly beans—22 white, 18 green, 11 yellow, 5 red, and

A certain jar contains 60 jelly beans—22 white, 18 green, 11 yellow, 5 red, and

游客2024-01-12  29
问题 A certain jar contains 60 jelly beans—22 white, 18 green, 11 yellow, 5 red, and 4 purple. If a jelly bean is to be chosen at random, what is the probability that the jelly bean will be neither red nor purple?
选项 A、0.09
B、0.15
C、0.54
D、0.85
E、0.91
答案 D
解析 Since there are 5 red and 4 purple jelly beans in the jar, there are 51 that are neither red nor purple, and the probability of selecting one of these is 51/60. Since all of the answer choices are decimals, you must convert the fraction to its decimal equivalent, 0.85.
Thus the correct answer is Choice D, 0.85.
This explanation uses the following strategies.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
Strategy 5: Simplify an Arithmetic or Algebraic Representation
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