A census in a particular country reported the distribution of family size shown. a) Find the mean and standard deviation of family size, treating "6 or more" as 6. b) If a random sample of 48 families is taken, would you expect their sizes to follow a Normal model? Explain. c) Consider the mean sizes of random samples of 48 families. Describe the sampling model for these means (shape, centre, and spread). Size Percent of Families 6 or more 2.5 5 6.1 4 14.7 3 17.4 2 32.7 1 26.6