A manufacture of cheese filled ravioli supplies a pizza restaurant chain. Based on the data collected from its automatic filling process, the amount of cheese inserted into the ravioli is normally distributed. To make sure that the automatic filling process is on target quality control inspectors take a sample of 25 ravioli and measure the weight of the cheese filling. They find a sample weight of 15 grams with a standard deviation of 1.5 grams. Describe the sampling distribution for the sample mean