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