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GRE数学真题OG版六

2018-04-27 10:49:00 来源:网络GRE资料下载

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  26.What is the least positive integer that is not a factor of 25! and is not a prime number?

  A 26

  B 28

  C 36

  D 56

  E 58

  27If 1 is expressed as a terminating decimal, how many nonzero digits 1/[(2^11)(5^17)]

  will the decimal have?

  A One

  B Two

  C Four

  D Six

  E Eleven

  28.Eight hundred insects were weighed, and the resulting measurements, in milligrams, are summarized in the boxplot below.

  (a) What are the range, the three quartiles, and the interquartile range of the measurements?

  (b) If the 80th percentile of the measurements is 130 milligrams, about how many measurements are between 126 milligrams and 130 milligrams?

  GRE数学真题OG版六

  29.

GRE数学真题OG版六

  The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.

  Suppose the heights of a population of 3,000 adult penguins are approximately normally distributed with a mean of 65 centimeters and a standard deviation of 5 centimeters.

  (a) Approximately how many of the adult penguins are between 65 centimeters and 75 centimeters tall?

  (b) If an adult penguin is chosen at random from the population, approximately what is the probability that the penguin’s height will be less than 60 centimeters? Give your answer to the nearest 0.05

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