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Catracho Catracho
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Posts: 529
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5 years ago
Find the expected value for the random variable.
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Educator
5 years ago
As far as I'm concerned, you do this:

9(0.14)+12(0.24)+15(0.36)+18(0.18)+21(0.08)... the sum is your answer

A sample calculation (not from here is attached)...
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