GWD 12-25

xdrertty

Q25:

If each of the 8 employees working on a certain project received an award, was the amount of each award the same?

(1) The standard deviation of the amounts of the 8 awards was 0.

(2) The total amount of the 8 awards was $10,000.

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.

求各位ＮＮ给点提示

ppp1

E

1.可能正標準差與付標準差之何也為零

2. 無結論

合起來 即使之平均與標準差 也無法得知各個數的值 答案E沒錯吧

himba

我也选了E 但是看前人的答案(有两分)都给的是A

有人可以讲一下这题吗

谢谢!!

mary1

刚刚查了一下 standard deviation

Sn = √(Σ(Xi - M)^2/n)

如果standard deviation=0 则一定是所有数相等

所以答案是A 没错

xdrertty

以下是引用mary1在2004-12-9 7:12:00的发言：

刚刚查了一下 standard deviation

Sn = √(Σ(Xi - M)^2/n)

如果standard deviation=0 则一定是所有数相等

所以答案是A 没错

非常感谢，我自己是一点思路 也没有啊