Hi I'm new here!
I was looking through an old exam that I totally bombed thinking that I should be able to do it now, but I'm turning up just as clueless. Not knowing the answer is realy bugging me:
"A particular website receives on average one hit per hour on a weekday afternoon. Let X denote the number of hits to be registered between noon and 3PM next Thursday.
a) Find Var(X)
b) Find P(X >=2)
c) Let Y denote the number of hits to be registered between 3PM and 6PM next Thursday. Find Var(X + Y)
d) Find E((X+Y)^2)
Any help would be greatly appreciated!