am, is, are填空 1.I_____a student. 2.What____your name,please? 3.How old______you,Mike? 4.This_____Mr Wang. 5.---Where ____”T”?----It_____here. 6.---Excuse me. _____you Tan Lin? ----Yes,I______. 7.----How ____you? ----I______fine. Thank you. 8.---______Sun Mei here?----No, she ______not. 9.-----What ____this? ----It _____”B”. 10. ---I ______sorry. ----- That _____all right. 答案:1.am 2.is 3.are 4. is 5. is is 6.Are, am 7.are am 8.Is is 9.is is 10.am ,is某中学对高三年级进行身高统计,测量随机抽取的20名学生的身高,其频率分布直方图如下(单位:cm) (1)根据频率分布直方图,求出这20名学生身高中位数的估计值和平均数的估计值. (2)在身高为140—160的学生中任选2个,求至少有一人的身高在150—160之间的概率.