"班级"	"不及格科目数"	"学生人数"
"1班"	2	3
"2班"	3	9
"4班"	3	7
"1班"	4	6
"2班"	5	4
"3班"	3	6
"1班"	3	3
"3班"	2	8
"4班"	2	2
"2班"	1	8
"3班"	1	6
"2班"	2	2
"3班"	5	5