问题
单项选择题
同上题,方差为()。
A.0.61%
B.0.62%
C.0.63%
D.0.64%
答案
参考答案:B
解析:
=(0.00-0.22)2×0.05+(0.1-0.22)2×0.15+(0.2-0.22)2×0.5+(0.3-0.22)2×0.15+(0.4-0.22)2×0.15
=0.62%。
同上题,方差为()。
A.0.61%
B.0.62%
C.0.63%
D.0.64%
参考答案:B
解析:
=(0.00-0.22)2×0.05+(0.1-0.22)2×0.15+(0.2-0.22)2×0.5+(0.3-0.22)2×0.15+(0.4-0.22)2×0.15
=0.62%。