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【单选题】
假定一个样本由5个数据组成:3,7,8,9,13。该样本的方差为A.
10
B.
111
C.
13
D.
18
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反馈参考答案：
举一反三
【单选题】It took us the whole day to trek across the rocky_
A.
floor
B.
soil
C.
earth
D.
terrain
【简答题】In 2007, when my daughter was seven years old, we would brush our teeth together every night as part of our _______.To_______water, we would turn off the faucet after wetting our brushes and turn it b...
【简答题】Several years ago I studied in a university in the biggest city in our country. It’s beautiful but it’s hot in ____1_____. So I usually returned to my hometown when my __2______ began. It is not big, ...
【简答题】Several years ago I studied at a university in the biggest city in our country. It’s beautiful but it’s hot in 1 . So I usually returned to my hometown when my 2 began. It is not big, but it’s cool an...
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