first we arrange values in an ascending order : 2960 ;3000;3400;3870;3960;4020;4070;4070;
Range= Maximum -minimum value=
4070-2960=1110
standard deviation =√[varience]

Jul 27th, 2015

first we arrange values in an ascending order : 2960 ;3000;3400;3870;3960;4020;4070;4070;
Range= Maximum -minimum value=
4070-2960=1110
standard deviation =√[varience]
mean = (2960+3000+3400+3870+3960+4020+4070+4070)÷8=3668.75
varience=199060.93714
sd=√199060.93714
= 446.162

Jul 27th, 2015

first we arrange values in an ascending order : 2960 ;3000;3400;3870;3960;4020;4070;4070;
Range= Maximum -minimum value=
4070-2960=1110
standard deviation =√[variance] mean = (2960+3000+3400+3870+3960+4020+4070+4070)÷8=3668.75 variance=199060.93714 sd=√199060.93714
= 446.162