30名小学生在进行速算比赛，要求学生们在规定的时间内做100道题。评判规则是：答对一题的1分，答错不得分。比赛结束后，按照每位学生的得分数排定名次。-30 pupils in the arithmetica, asked the students do 100 questions within the prescribed period of time. The uation rule is: correct answer 1 minute, wrong not score. After th