Contact us
Choose a category below so we can get back to you as quickly as possible.
∵數據8,9,7,8,x,4的平均數是7,∴(8+9+7+8+x+4)÷6=7,∴x=6,∴這組數據的方差為:16[(8-7)2+(9-7)2+(7-7)2+(8-7)2+(6-7)2+(4-7)2]=52;故答案為:52.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.