please answer the following :)

9. The following data comes from a survey of 10 random SMC students. I want to use this survey data to make an inference about all SMC students. |2o|28|24|1s|2o|19|19|21|2n|21| b. (5 points) Assuming this sample was drawn from a normal population, show how you would use this sample to calculate a 90% confidence interval for the true population mean. As part of your answer, state the boundaries of that confidence interval