Question 997213
 
Given:
Two (assumed) independent variables X, Y, each with variance var(x)=2.3 and 1.8, and mean {{{mu x}}} and {{{mu y}}}respectively
 
To Find:
Mean of total, Z=X+Y.
 
Solution:
The mean of the sum of two independent variables X, Y 
= {{{mu x + mu y}}}
The variance of the sum of two independent variables X, Y 
= {{{var(X)+var(Y)=2.3+1.8=4.1}}}