The following are the weights, in decagrams, of 10 packages of grass seed distributed by a certain company: 46.4, 46.1, 45.7, 47.0, 46.1, 45.9, 45.3, 46.9, 45.2, 46.2. Assuming that a normal population is used, use R to answer the following questions (You need to include R codes in your answers). (a) Find the 93% confidence interval (C.I.) for the mean weight of a package of grass seed. (b) Let obe the variance of the weight of a package of grass seed. Find the 95% C.I. for 1/o