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Econometrics

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Independent Probabilities in a Casino

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Suppose a casino uses a die to determine the outcome of a game. Each roll is independent of all others. Furthermore, the die does not have the typical 6 sides. Instead it has 21 equal sides. The casino assures you that each side is equally likely.

If it is rolled 50 times, then how many rolls do you expect to be greater than 10?

A

40

B

26

C

21

D

11

E

10