题目

从某项综合能力测试中抽取100人的成绩，统计如表，则这100人成绩的标准差为（    ） 分数54321 人数2010303010 A.                B．                C．3                  D． 答案：D阅读短文，判断对错。对的写T ，错的写F。Tom and John are good friends. Tom is twelve years old. John is thirteen years old. They are good students. They like to eat hamburgers. Miss White is their English teacher. She likes them very much.【1】Tom and John are good friends. （____）【2】Tom is twelve years old. （____）【3】John is twelve years old. （____）【4】Tom likes to eat hamburgers. （____）【5】Miss White likes them very much. （____）【6】John doesn’t like to eat hamburgers. （____）