6. Generate a vector of 1000 standard normal random variables using the command x=rnorm (1000), use R to compute the 1st, 5th, 95th and 99th percentile of your x; Also compute the mean and variance of your x variable. Generate a vector of 1000 student t random variables using the command y=rt(1000,3), use R to compute the 1st, 5th, 95th and 99th percentile of your y; Also compute the mean and variance of your y variable. Make and print two histogram for these two dataset. What can you say regarding the differences between these two distributions. ( no need to print out the generated 2000 numbers)