(Answered) A box contains 5 red 8 white 4 black and 10 greens marbles

Statistics

A box contains 5 red, 8 white, 4 black and 10 greens marbles. In a game of drawing 1 marble from the box, a player receive $2 if she draws a red marble, $1.50 if she draws a white marble and $3 if she draws a black marble. The player must pay $4 if she draws a green marble. Find the expected value in the games.

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