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Help 19

NotSoSmart  Oct 4, 2018
 #1
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+1

Mean  = [ 10 + 19 + 21 + 28 + 12 +  20 + 16 ] / 7  = 18

 

Squared  differences  from  mean

(10 - 18)^2  = (-8)^2  = 64

(19 - 18)^2  = 1^2  = 1

(21 - 18)^2  =  3^2  = 9

(28 -- 18)^2  = 10^2  = 100

(12 - 18)^2  = (-6)^2  = 36

(20 - 18)^2 = 2^2  = 4

(16 -  18) ^2  =  (--2)^2  = 4

 

Variance  = sum of  squared differences / number of values = [ 64 + 1 + 9 + 100 + 36 + 4 + 4 ] / 7  = 31.14

 

 

cool cool cool

CPhill  Oct 4, 2018

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