The answer would be ay-xb
In addition to mean and sample size you will need the individual scores.
The formula for standard deviation is:
S^2 = E(X-M)^2/N-1
Here's an example:
Data set: 4,4,3,1
Mean: 3
Sample size: 4
First, put the individual scores one after the other and subtract the mean from it.
4 - 3 = 1
4 - 3 = 1
3 - 3 = 0
1 - 3 = -2
Second, square the answers you got from step 1.
1^2 = 1
1^2 = 1
0^2 = 0
-2^2 = 4
Third, plug the values from step 2 into the formula.
S^2 = (1+1+0+4)/(4-1) = 6/3 = 2
Standard deviation = 2
5/21 expressed as a decimal is D 0.238095
Radius = 4 feet
Height = 3 feet
Formula :
Volume =
πr2h
———
3
Solution :
3.14 x 42 x 3
——————— =
3
3.14 x 16 x 3
——————— =
3
150.7964
—————-
3
Volume = 50.2655 feet³
