19. The data set agsrs. csv also contains information on other variables. For each of the following quantities, plot the data, and estimate the population mean for that variable along with a 95% CI. (a) Number of acres devoted to farms in 1987 (b) Number of farms, 1992 (c) Number of farms with 1000 acres or more, 1992 (use variable largegg) ) ((1 Number of farms with 9 acres or fewer, 1992 (use variable smal 1392)