In O'Jax cereal, there is one gift included in every box. A pencil comes 50% of the time, a doll comes 15% of the time, a latern comes 30% of the time, and a cardboard game comes 5% of the time. What is the expected number of boxes one needs to buy to get all of the gifts?
Hint: Find a mathematical expression for the probability of getting any prize, multiply them, and predict the expected value.
Level: 5
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