Standard Deviation

[dentovis]

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Can anyone explain how to calculate the standard deviation of a set of numbers? It's one of the last questions in DAT Destroyer QR section.

 

[hasanein4u]

I used to be confused when I see the word standard deviation and thought of skipping the question... but now it is easy:

Let's say the set of numbers is {a,b,c,d,e,f} which has 6 numbers

1- get the average of the set of numbers = a+b+c+d+e+f/6
2- (average-a)^2 + (average-b)^2 + (average-c)^2 + (average-d)^2 + (average-e)^2 + (average-f)^2 / 6 = VARIANCE

3- Standard Deviation= square root of Variance


THAT'S IT ^___^

by a little practice it will take less than a minute


http://www.mathsisfun.com/data/standard-deviation.html

 

[dentovis]

I used to be confused when I see the word standard deviation and thought of skipping the question... but now it is easy:

Let's say the set of numbers is {a,b,c,d,e,f} which has 6 numbers

1- get the average of the set of numbers = a+b+c+d+e+f/6
2- (average-a)^2 + (average-b)^2 + (average-c)^2 + (average-d)^2 + (average-e)^2 + (average-f)^2 / 6 = VARIANCE

3- Standard Deviation= square root of Variance


THAT'S IT ^___^

by a little practice it will take less than a minute




http://www.mathsisfun.com/data/standard-deviation.html

OMG I love you! This made it so easy! Thank you!!!!😍😍😍