Nikki Rauguth is the food and beverage manager at Harrison Residence Hall, the largest student housing facility on State University campus. Once each month, Nikki features an "Italian night," a themed dinner, for her students. She serves the following four menu items listed. Nikki has maintained sales histories showing the number of individual menu items selected for each of her last three "Italian nights." Calculate the total number of each menu items served over the past three months then use that information to calculate each menu item's popularity index.

Month 1 Month 2 Month 3 3-Month Total Popularity Index

Menu Item

Lasagna 215 130 164

Pasta Carbonara 65 52 74

Seafood Shells 35 62 64

Pork Milanese 98 145 116

Total Served

Over the entire three-month period, which Italian-themed menu item was the most popular with Nikki's students?

Which menu item was the least popular?