Please assist and please show R code

The built-in data set OUKgasO is a time series which Quarterly UK gas consumption from 1960Q1 to 198604, in millions of therms. Using R we can convert this data into the vector x by the assignment x30 we can create a confidence interval for / using a normal critical value. If we want the confidence interval to be at the 96% level and we use a normal critical value, then what critical value should we use? i) Calculate a 96% confidence interval(using a normal critical value) for u. j) How long is the 96% confidence interval just created in part i? k) Copy your R script for the above into the text box here