Is the standard deviation of the salaries of Company Y’s employees greater than the standard deviation of the salaries of Company Z’s employees?

(1)   The average (arithmetic mean) salary of Company Y’s employees is greater than the average salary of Company Z’s employees.

(2)   The median salary of Company Y’s employees is greater than the median salary of Company Z’s employees.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

 E

你可以想象一下

条件1、2都没有限制两公司的最高H和最低工资L

所以把（H/L）变为（H+S/L-S）不影响条件1、2但总方差变大

所以条件1、2对方差不具有约束性，因此无法得出特定结论

明白了吗？