Question

設(shè)一組數(shù)據(jù)的方差是s²,將這組數(shù)據(jù)的每個(gè)數(shù)據(jù)都乘以10，所得到的一組新數(shù)據(jù)的方  差是

A.0.1s²                                                 B.s²                                                           C.10s²                                                    D.100s²

Answer 1

D

解析:

本題考查方差公式.

設(shè)原數(shù)據(jù)為x₁,x₂,…,x_n,

=,

s²=,

新數(shù)據(jù)為10x₁,10x₂,…,10x_n,

且a==10,

方差s₁²₌=

==100s².