MY NOTES ASK YOUR TEACHER How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20'F to 45.F. A random sample of prices ($) for sleeping bags in this temperature range is given below. Assume that the population of x values has an approximately normal distribution. 60 115 110 35 30 100 110 105 95 105 110 120 90 60 In USE SALT (a) Use a calculator with mean and sample standard deviation keys to find the sample mean price x and sample standard deviation s. (Round your answers to four decimal places.) X 80.40 31.1370 (b) Using the given data as representative of the population of prices of all summer sleeping bags, find a 90% confidence interval for the mean price & of all summer sleeping bags. (Round your answers to two decimal places.) lower limits 68.95 X X upper limit 91.85