The figure shows a standard normal distribution with mean of 160 and standard deviation d, including approximate percents of the distribution corresponding to the regions shown. If the value 148 is at the 12th percentile of the distribution, which of the following is the best estimate of the standard deviation dof the distribution?

A) 5

B) 10

C) 15

D) 20

Transcribed Image Text:

2% 34% 34% 2% 14% 14% 160-2d 160 d 160 160+d 160+2d