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