Please help, this my answers are incorrect.

A hair salon in Cambridge, Massachusetts, reports that on seven randomly selected weekdays, the number of customers who visited 18 the salon were 52, 67, 33, 44, 54, 26, and 66. It can be assumed that weekday customer visits follow a normal distribution. [You may find it useful to reference the t table.] a. Construct the 90% confidence interval for the average number of customers who visit the salon on weekdays. (Round intermediate calculations to at least 4 decimal places, "sample mean" and "sample standard deviation" to 2 decimal places. Round "t" value to 3 0.6/3 points awarded decimal places and final answers to 2 decimal places.) Scored Confidence interval 60.30 X to 37.42 X eBook Print References b. Construct the 99% confidence interval for the average number of customers who visit the salon on weekdays. (Round intermediate calculations to at least 4 decimal places, "sample mean" and "sample standard deviation" to 2 decimal places. Round "t" value to 3 decimal places and final answers to 2 decimal places.) Confidence interval 70.69 X to 27.03 X