joelleygonzalez6767 joelleygonzalez6767 25-05-2023 Mathematics contestada Determine the mean and variance of the random variable with the following probability mass function. f(x)-(8 / 7)(1/ 2)×, x-1,2,3 Round your answers to three decimal places (e.g. 98.765) Mean Variance the tolerance is +/-290