DiscussWorldIssues - Socio-Economic Religion and Political Uncensored Debate - View Single Post - math guys: how does one figure out a standard deviation

**Stoniaanapy** · 05-09-2007, 07:48 AM

Originally posted by Lawrence of Arabia
which means that your little example here

The population standard deviation can be simply calculated as follows:

1) sum all values
2) sum the squares of all values
3) square the result from (1)
4) Divide (3) by N (the number of values)
5) Subtract (4) from (2)
6) Divide (5) by N
7) Take the square root of (6)

So, if we have 3, 6, and 7 as values:

1) = 3+6+7 = 16
2) = 9 + 36 + 49 = 94
3) = 16*16 = 256
4) = 256/3 = 85.33
5) = 94 - 85.33 = 8.67
6) = 8.67/3 = 2.89
7) = SQRT(2.89) = 1.7

approaches zero as n increases. Could you please provide me with an estimate of the standard deviation of a set of 100 dice rolls then?

05-09-2007, 07:48 AM	#15
Stoniaanapy Join Date Nov 2005 Posts 352 Senior Member	Originally posted by Lawrence of Arabia which means that your little example here The population standard deviation can be simply calculated as follows: 1) sum all values 2) sum the squares of all values 3) square the result from (1) 4) Divide (3) by N (the number of values) 5) Subtract (4) from (2) 6) Divide (5) by N 7) Take the square root of (6) So, if we have 3, 6, and 7 as values: 1) = 3+6+7 = 16 2) = 9 + 36 + 49 = 94 3) = 16*16 = 256 4) = 256/3 = 85.33 5) = 94 - 85.33 = 8.67 6) = 8.67/3 = 2.89 7) = SQRT(2.89) = 1.7 approaches zero as n increases. Could you please provide me with an estimate of the standard deviation of a set of 100 dice rolls then?
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