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Cumulative function

Hi ! I am having trouble solving this question.

The probability distribution table I set up , doesn’t give the correct form that it should be . The sum of the values for each random variable isn’t adding up to 1 . In fact , more than 1 .

Why is that happening ? And how can we solve it ? Thank you !image.jpg
(edited 1 year ago)
For 5, that must be the cumulative and the left is P(X<=x)

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