问题
选择题
已知一组数据：15，13，15，16，17，16，14，15，则这组数据的极差与众数分别是（ ）
A．4，15
B．3，15
C．4，16
D．3，16
答案
极差为：17-13=4，
数据15出现了3次，最多，故众数为15，
故选A．
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已知一组数据：15，13，15，16，17，16，14，15，则这组数据的极差与众数分别是（ ）
A．4，15
B．3，15
C．4，16
D．3，16
极差为：17-13=4，
数据15出现了3次，最多，故众数为15，
故选A．
He is a 16-year-old boy. __1__name is Alan Brown. Alan is __2__ American high school student. He lives at __3__ Road. Art and music __4__ his favourite subjects. He loves studying and also loves sports. He usually goes swimming three or four times every week. And he walks after supper every _5__. Cool water and clean air always make him happy. American students are quite different from __6__. On Saturdays, he often has parties __7__ his friends and they always enjoy themselves. On Sundays, he usually __8__ at home and watches TV.
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