For the following question i was just wondering, i know how to answer it but i am unsure of how i write it with the proper use of formula, would you be able to show me how the answer looks with the proper working out

The weights of aluminum castings produced by a process are normally distributed. A random sample of 5 castings is selected; the sample mean weight is 2.21 pounds; and the sample standard deviation is 0.12 pound. The 98% confidence interval for the population mean casting weight is?