If we define a random variable X as the number of units sold per day, use these data to estimate the probability distribution and cumulative distribution for X in a tabular format, (this can be done by doing a quick pivot table, dragging "number unit solved" to the rows area, and count how many days are associated with each number of unit sold.) and calculate the Expectation of X. Day Number of stoves sold 1 5 2 2 3 2 4 3 5 3 6 6 7 4 8 4 9 3 10 5 11 5 12 4 13 4 14 4 15 4 16 2 17 4 18 3 19 5 20 2 21 3 22 3 23 3 24 4 25 5