一題 GMAT-data sufficient -2

Q1: If each of the 8 employees working on a certain project received an award, was the amount of each award the same?
條件1:The standard deviation of the amount of the 8 award was 0.
條件2:The total amount of the 8 awards was $10,000.
答案是:條件一單獨成立。
為什麼條件1的標準差=0 能力呀???
請詳細解說謝謝!!
1 個解答 1