How do I find the standard deviation of a group of numbers?

Answer 1

well, first you find the average, and then find the average for how far each difference between each number and the average,
say you have the numbers a b c d. And your average is x.
Well, the standard deviation is
the absolute value of (a-x) plus the ab of(b-x) plus the ab of(c-x) plus the ab of(d-x). The sum of the differences devided by four(four differences) is the standard deviation.

Answer 2

1) find the sum of the numbers
2) find the mean of this sum
3) subtract the mean from each number
4) square these numbers
5) add those numbers together
6) take this number and divide by the original amount of numbers minus one
7) take the square root of this number

ex.
X
7
5
4
3
1
=20 : to find mean 20/5 because there are 5 numbers

mean equals four

X X square these numbers: Xsquared
7-4 = +3 9
5-4 = +1 1
4-4 = 0 0
3-4 = -1 1
1-4 = -3 9
find the sum: 20
divide twenty by total numbers (5) minus 1, which is 4
20/4=5
find the square root of 5: standard deviation equals 2.24