Rodrigo plans to buy packs of baseball cards until he gets the card of his favorite player, but he only has enough money to buy at most three packs. Suppose that each pack has a 10% chance of containing the
card Rodrigo is hoping for.
The table below displays the probability distribution of X, the number of packs of cards Rodrigo buys.
X = # of packs
1
2
3
P(X)
0.10
0.09
0.81
Calculate the mean of X.