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Statistics
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Compute the range and sample standard deviation for strength of the concrete.(in psi)

3960, 4070, 3400, 3000, 2960, 3870, 4070, 4020

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]
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


Jul 27th, 2015

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Jul 27th, 2015
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Jul 27th, 2015
Dec 4th, 2016
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