Help please. I have the basic idea about how to work with single variable but this one just blew me over.
Derive a moment generating function, then find the mean and variance of
f(x,y,z)= 4/9 xyz^2 0 less than or equal to x less than or equal to 1,
0 less than or equal to y less than or equal to 1,
0 less than or equal to z less than or equal to 3
NB. For the function it is zero elsewhere & z is actually raised to the second power.
