NEED HELP PLEASE the following random sample was selected from a normal distribution

5 20 18 3 10 2 6 9 19 13

a) construct a 90% confidence interval for the population mean

b) construct a 95% confidence interval for the population mean

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.