Source: Revised GRE PDF 1st Ed. Section 6: Math; #16 (p. 88)

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The figure shows a normal distribution with mean

The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution in each of the six regions shown. For a population of 800,000 subway riders, the numbers of subway trips taken per rider last January are approximately normally distributed with a mean of 56 trips and a standard deviation of 13 trips. Approximately how many of the riders took between 30 and 43 trips last January? 60,000, 110,000, 160,000, 210,000, 270,000

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Gravatar Chris Lele, Magoosh Tutor

Sep 26, 2012 • Comment

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