一道统计学的英文题~The following data refer to the number of customer

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一道统计学的英文题~
The following data refer to the number of customers who enter a certain store over a period of 14 days:
28 29 30 28 29 34 20
15 20 27 34 29 15 24
find:
(a) the median
(b) the mode
(c) the sum of the data values
(d) the mean
(e) the first or lower quartileQ1

题目是：下面的数据是某一家商店14天来每天进的顾客数量.
(a) the median 中位数 28
(b) the mode 众数 29
(c) the sum of the data values 求和 362
(d) the mean 均值 25.85714286
(e) the first or lower quartileQ1 25分位（上四分位）值 21

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