A roulette wheel has the numbers 1 through 36, as well as O and 00. If you bet $1.00 that an odd number comes up, you win or lose $1.00 according to whether or not that event occurs. If X denotes your net gain, X-1 with probability 18/38 and X= -1 with probability 20/38. We already calculated the mean to be = -$.053. What's the variance of X?

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