Aflorist determines the probabilities for the number of flower arrangements they deliver each day. x 19 20 21 22 23 p ( x ) 0.24 0.21 0.32 0.13 0.10 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?