P296中一道关于计算 interquartile range的题目,原题如下:2. The numbers of passengers on 9 airline ?ights were 22, 33, 21, 28, 22, 31, 44,) 50, and 19. The standard deviation of these 9 numbers is approximately.
equal to 10.2
If each ?ight had had 3 times as many passengers, what would have been
the mean, median, mode, range, interquartile range, and standard
deviation of the nine numbers?
这个 interquartile range我觉得怎么应该是Q3-Q1=33-22=11呢?这一系列数字19、21、22、22、28、31、33、44、50难道Q3和Q1不是分别为33、22吗?
4、关于正态分布,请注意区分标准正态分布和一般正态分布。
标砖正态分布:The standard normal distribution has mean 0 and standard deviation 1. The following figure shows the distribution, including approximate probabilities corresponding to the six intervals shown.,那张正态分布图上的0.02、0.14、0.34这些数据都要记下来~据说前面几场考试有涉及。
以上便是新GRE数学最易掉入的陷阱,希望对各位考生有所帮助。新GRE数学的难度会随第一个section的准确率而相应的提高难度,希望大家都能取得GRE考试高分!
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