Discrete Probability Distribution : Finding Unknown Probabilities |Statistics and Probability

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This video shows how to apply the second property of discrete probability distribution in determining two missing probabilities.
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Sir, Based on what you assume P(4) = x+.04? Where you get .04 from?
I have a issue where E(x) is given as 1.75 and asked to find two missing probabilities. How do I do that?

jewelc