试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
Experiments show that on a normal distribution curve the deviation from the mean represented by the top of the curve is equal on both sides.（）
参考答案
正确答案：
试题解析
deviation 偏差；difference 差额。
实验表明，在正态分布曲线上，曲线顶部表示的平均值与两侧的平均值的偏差相等。