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A florist determines the probabilities for the number of flower arrangements they deliver each Type numbers in the boxes. 3by Part 1: 4 points day. by Part 2: 4 points 3by Part 3: 2 points ab Part 4: 2 points 12 points 19 20 21 22 23 P(a) 0.21 0.22 0.35 0.13 0.09 Find the mean, variance, and standard deviation of the distribution rounded to 4 decimal places. Mean = Variance = Standard Deviation = Approximately how many arrangements should the florist expect to deliver each week, rounded to the nearest whole number