问题
填空题
数据11,7,10,9,13的极差是______,方差是______.
答案
极差:13-7=6;
=. x
=10,11+7+10+9+13 5
S2乙=[(11-10)2+(7-10)2+(10-10)2+(9-10)2+(13-10)2]÷5=4.
故答案为:6;4.
数据11,7,10,9,13的极差是______,方差是______.
极差:13-7=6;
=. x
=10,11+7+10+9+13 5
S2乙=[(11-10)2+(7-10)2+(10-10)2+(9-10)2+(13-10)2]÷5=4.
故答案为:6;4.