题目

Marianne Carus, who started Cricket（蟋蟀）magazine in 1973 and served as Editor-in-Chief（总主编）until 2012, died on March 3 at the age of 92 this year. Marianne believed that “only the best of the best is good enough for the young.” In Cricket, children would find wonderful stories with beautiful art, and be encouraged by ideas in the humanities and sciences. Marianne looked for stories from around the world to awaken admiration for different peoples and cultures. Most important, Cricket would never talk down to children. Marianne knew that children were filled with fun, and sh（2006•宜宾）（1）计算：；（2）某校对初二学生的身高情况进行了抽样调查，被抽测的10名学生的身高如下：（单位：cm）167  162  158  166  162  151  158  160  154  162①这10名学生的身高的众数是______，中位数是______．②根据样本平均数估计初二年级全体学生的平均身高约是多少厘米？（3）化简求值：，其中．