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I'll give lists, each corresponding to the respective position on the next list:
Profit: .5, 1.5, 2, 4, 8
Probability: .1, .2, .4, .2, .1
Find the mean profit
Find the variance of the profit
Find the standard deviation of the profit
This is on a take-home quiz of mine. A couple of the available formulas are:
E(X)= Ex*p(x) (the second E is that weird one that looks Greek)
Var(x)= E(x-mew)^2p(x) (again, same type of weird E)