This is a survey of the birthday of students in five classes

This is a survey of the birthday of students in five classes.
(下面是一张表格)
Month Number of students
Jan.------------------- (12)
Feb.------------------- (16)
Mar.------------------- (25)
Apr.------------------- (39)
May.------------------- (30)
Jun.------------------- (15)
Jul.------------------- (9)
Aug.------------------- (18)
Sept.------------------ (23)
Oct.------------------- (34)
Nov.------------------- (21)
Dec.------------------- (17)
1.__________students were born in the first three months.
2.The most students were born in _______.
3.________students' birthdays are in the last three months.