need help in this probability and statistic question with clear steps and 4 decimal place, thank you

Question 1 {10 marks} Assume that the waiting times by customers at a certain bank are normally distributed. A random sample of 10 customers is drawn and their waiting times (in minutes) are recorded as below: 13 15 16 22 8 13 7 9 15 16 (a) Find the sample mean and the sample standard deviation. (1:) Construct a 95% confidence interval estimate for the mean waiting time of all customers. (c) The bank manager claims that \"The population mean waiting time is less than 10 minutes\". Do you agree\"? Explain your