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A raffle costs $5 to play. You have 20% chance of winning $20. Otherwise you lose. A. What is the expected value of this game?

A raffle costs $5 to play. You have 20% chance of winning $20. Otherwise you lose. A. What is the expected value of this game? B. Should you play this game? Yes or No? 2. What is the probability that a standard normal variable will be equal to -0.67or in other words P(z=-0.67) 3. A variable X has a normal distribution with mean 60 and standard deviation 5. Approximately what percentage of the observations will fall between 55 and 65

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