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The number of cellular phones sold per day at the E-Cell Retail Store with the corresponding probabilities is shown in the table below. Compute the mean, variance, and standard deviation and interpret the result. Number of cellphones sold per day in a retail store () 15 18 19 20 22 Probability (() 0.30 0.20 0.20 0.15 0.15 Solution: Complete the statement: = ∑[ ∙ ()] = 15(0,30) + 18(0.20) + 19(0.20) + 20(0.15) + 22(0.15) = _______
