高手救命

chinaben

25) x, y, z are primes, x^3*y^3*z^3=? a) x^3*y*z=728; b)x^2=... (A)
Answer:  E

x^3*y*z=728----2^3*13*7,,,and x, y, z are primes,then X=2,y*z=13*7

answer maybe  A

26) 53 is the standard deviation of T(一数列) greater than S(一数列) ?
(1) mean of T is greater than that of S
(2) median of T is greater than that of S
Answer:  A

疑惑，请高手指导

tongxun

25、A
这个题目怎么着也不能是E

26、E
只知道方差而已，而数列中的数字大小、差别都不知道，怎能的出A？