<PRE><B>Question 709390</B>
Solution for Mean:
Add all the numbers and then divide by 15
40 44 43 15 22 29 38 22
14 13 28 29 47 31 18

Mean= 28.87

Solution for standard deviation:
Use the formula for standard deviation
{{{ sqrt(sum ((X[i]-mean)^2, i=1, N)/N)}}}
={{{ sqrt(sum ((X[i]-28.87)^2, i=1, 15)/15)}}}

Standard Deviation=11.10

Solution for Variance:
Simply: (Standard Dev)^2
Variance= (11.10)^2 = 123.18</PRE>