can someone help me how to do this problem please?

N clinic offers a weight-loss program. The table below gwes the amounts of weight loss, in pounds, for a randem sample of 20 of its clients ax the conclusion of the program. Assume that the data are notmally distributed. Complete parts (a) and (b). a. Find a 90% confidence intervai for the population mean The 900 confidence interval in from a lower limt of 10 an upper limt of (Round to two decimal places as needed) the correct answer beiow