According to usa today, customers are not settling for automobiles straight off the production lines. as an example, those who purchase a $355,000 rolls-royce typically add $25,000 in accessories. one of the affordable automobiles to receive additions is bmw's mini cooper. a sample of 179 recent mini purchasers yielded a sample mean of $5,000 above the $20,200 base sticker price. suppose the cost of accessories purchased for all mini coopers has a standard deviation of $1,500. calculate a 95% confidence interval for the average cost of accessories on mini coopers.