• (A) 条件(1)充分，但条件(2)不充分．
• (B) 条件(2)充分，但条件(1)不充分．
• (C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
• (D) 条件(1)充分，条件(2)也充分．
• (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

Class	Average Age	No. of Students
A	15 years	6
B	16 years	12

Is the standard deviation of ages of students in class A greater than the standard deviation of the age of students in class B
(1) The difference between the ages of any two students in class A is always more than 1 year.
(2) No Student in class B is more than 6 months older than any other student.