Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13.

Anzyumoh

3 years ago

. from Thier solution if ur confused. x = sum of all values of x/n. = 7+8+9+10+11+12+13/7, = 70/7, = 10. then subtract all values of x by 7.

ejis1

2 years ago

sorry but, when i took an exam,the previous question before this was also a standard deviation question, but when i saw the solution, they didnt square root it so im very confused now

EmmanuelA13

4 years ago

From the question, I noticed the data given was an arithmetric progress (n, n+1, n+2, ...)
To find the standard deviation of A.P
use
s.d = |d| * sqrt( [ (n-1)*(n+1) / 12 ] )
where n = size of data
s.d = standard deviation
|d| = absolute value of the common difference ( if the common difference is negative e.g -5, use its absolute value; e.g 5)

Hope this tips is useful.
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