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 3 95%- CI Use R to do this problem 8: Please, put your R code in an Appendix, not in the core of the rat. (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 laryeqz?) (cl) Number of farms with 9 acres or fewer, 1992 (use variable smallfg)