The following data are wait times (in seconds) for a randomly selected sample of customers in line at a local grocery store. Assume wait times are normally distributed.

104 126 63 94 122 117 138 171 148 119

(a) Find a point estimate for the mean wait time of all grocery store customers. Use appropriate notation and round to one decimal place. (b) Construct a 95% confidence interval for the mean wait time of all grocery store customers. Indicate which procedure you used and interpret your answer.