Please help

The table below contains the amount that a sample of nine customers spent for lunch ($) at a fast-food restaurant. Complete parts a and b below. 4.87 5.48 5.54 6.58 7.21 7.76 8. 16 8. 18 9.75 a. Construct a 95% confidence interval estimate for the population mean amount spent for lunch at a fast-food restaurant, assuming a normal distribution. The % confidence interval estimate is from $ to $ (Round to two decimal places as needed.)