GRE Problem Solving Question 307

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Source: 150math

The figure above shows the standard normal distribution, with mean 0 and standard deviation 1, including approximate percents of the distribution corresponding to the six regions shown. The random variable Y is normally distributed with a mean of 470, and the value Y = 340 is at the 15th percentile of the distribution. Of the following, which is the best estimate of the standard deviation of the distribution

  • A 125
  • B 135
  • C 145
  • D 155
  • E 165

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