标题: q求助！prep08上的一道题 [打印本页] 作者: Angie12 时间: 2017-10-11 17:35 标题: q求助！prep08上的一道题 A certain list of 100 data has an average (arithmetic mean) of 6 and a standard deviation of d, where d is positive. Which of the following pairs of data, when added to the list, must result in a list of 102 data with standard deviation less than d ?
A -6 and 0
B 0 and 0
C 0 and 6
D0 and 12
E6 and 6
正确答案是E