把每一组的频率逐组相加,找出包含中位数的那一组.Add the frequencies in each class to find the class that contains that centermost element.一半数值低于中位数,一半数值高于中位数.One half of its values will be found below and one half above the median.儿童发铅中位数为7.45×...

“中位数”的英语可以翻译为：median ...