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anyewumian · 2020年02月12日

问一道题:NO.PZ2017092702000153

问题如下:

Using the data from the table, the difference between the median and the mode is closest to:



A


B


C


D


E


F


选项:

A.

–1.41.

B.

0.00.

C.

1.41.

解释:

B is correct. The median is the value of the middle item of a set of items sorted into ascending or descending order. In an even-numbered sample, we define the median as the mean of the values of items occupying the n/2 and (n + 2)/2 positions (the two middle items). Given Table 2 has six observations, the median is the mean of the third and fourth observations. Because both are–1.20, the median is –1.20. The mode is the most frequently occurring value in a distribution. The only value occurring more than once is –1.20. Because the median and the mode both equal –1.20, their difference is zero.

A is incorrect because –1.41 is the difference between both the identical mode and median with the arithmetic mean. Both differences are: [–1.20 – (0.21)] = –1.41.
C is incorrect because 1.41 is the difference between the arithmetic mean with both the identical mode and median. Both differences are: [0.21 – (–1.20)] = 1.41.

老师这道题是什么意思,,是求quantiles

1 个答案

星星_品职助教 · 2020年02月12日

同学你好,

求的是中位数median和众数mode的差,和quantile没关系

只是这里面中位数的求法比较特殊,由于总数是六个数,所以中位数是第三和第四个数加起来后再除以2