"班级"	"不及格科目数"	"学生人数"
"2班"	4	5
"3班"	4	9
"1班"	4	3
"3班"	2	5
"4班"	2	8
"1班"	2	6
"3班"	5	1
"1班"	1	6
"3班"	1	5
"4班"	5	6
"2班"	3	9