Question: i know this is a bit simple but im confused on how to work these problems, and the book was of no help please explain

i know this is a bit simple but im confused on how to work these problems, and the book was of no help please explain how you got the answer! Please!

1.)Suppose an experiment haseightpossible outcomes forx:0, 1, 2, 3, 4, 5, 6, 7. The probability that each of these outcomes occurs isx/28. What is the expected value ofxfor the experiment?

2.)Five slips of paper containing the numbers1, 13, 19, 25, 27are placed in a hat. If the experiment consists of drawing one number, and if the experiment is repeated a large number of times, what is the expected valueE(x) of the number drawn?

E(x) =

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