利用Excel软件的数据统计功能，分别统计成绩在90-100分、80-89分、70-79分、60-69分以及60分以下的学生人数

=COUNTIF(B:B,">=90")……成绩在B列…… =Countif(B:B,">=80")-COUNTIF(B:B,">=90")…… =Countif(B:B,">=70")-COUNTIF(B:B,">=80")…… =Countif(B:B,">=60")-COUNTIF(B:B,">=70")…… =