初中3年级 - 杂文 阅读指导

　　Mean 62.55
　　Std Dev 4.2423385
　　N 40
　　100.0% maximum 70.000
　　75.0% quartile 65.000
　　50.0% median 63.000
　　25.0% quartile 60.250
　　0.0% minimum 51.000
　　Description.
　　The distribution of students’ heights is unimodal, approximately symmetric. The typical student height is the mean, which is 62.55 inches. The standard deviation of the distribution is about 4.24. With a minimum height of 51 and a maximum value of 70, most data falls between the bins 60 – 62.5. There is a gap between 52.5 and 55. From the box plot, we could see there are 2 outliers. And according to the 1.5IQR rule, 1.5 (65-60.25) = 7.125. Lower fence is Q1- 7.125 = 53.125 which is higher than 51 and 52 inches.