Hugo 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 4 packs. Suppose that each pack has probability 0.2 of
containing the card Hugo is hoping for,
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Let the random variable X be the number of packs of cards Hugo buys. Here is the probability
distribution for X:
X = # of packs 1 2
P(X)
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3
0.2 0.16 0.128
4
0.512
What is the probability that Hugo buys fewer than 3 packs of cards?
(fewer than 3 packs):