1.一数列平均数46,标准方差4,问:which value is exactly 1.5 standard deviations from the arithmetic mean of the set? 答案:50
2.一人在卡片上写了1到20这20个整数,然后每次任意抽一张不放回,为保证他抽出的所有卡片数字和为偶数,问要抽多少张?答案:12
3.一个连续数列 问中间又没有数是8的multiple
A 9-15
B 有10个数
3. A you don't know for sure
B yes if there is 10 number in a serie there must be a number that's / by 8 so B
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