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Current Attempt in Progress The following function is probability mass function. -2 -1 0 1 2 f(x) 1/7 1/7 3/7 1/7 1/7 Determine the mean,

Current Attempt in Progress The following function is probability mass function. -2 -1 0 1 2 f(x) 1/7 1/7 3/7 1/7 1/7 Determine the mean, , and variance, ", of the random variable. Enter the exact answers (as fractions if necessary)

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