Answer:
Step-by-step explanation:
We have the following properties:
So, if we have that E[X(X-1)] = 27.5, we can write them using the first property as:
Then, replacing E(X) by 5 and solving for , we get:
Finally, using the second property and replacing by 5 and by 32.5, we get that V(X) is equal to:
there are no solutions
x3(2x5)-4(2x5
Hope that helps