"班级"	"不及格科目数"	"学生人数"
"1班"	2	3
"3班"	4	5
"4班"	2	7
"1班"	5	3
"3班"	2	9
"4班"	3	4
"1班"	1	2
"2班"	2	9
"4班"	5	10
"2班"	1	7
"2班"	4	8
"3班"	1	4