A gourmet pizza restaurant is considering adding new toppings to its menu. Each month they survey 10 customers about their preferences for three different toppings. They want data on several different toppings, so they don’t always ask about the same three toppings. Customers rate each topping on a scale of 1(would never order) to 5 (would order often). The restaurant wants to compute average ratings for all toppings, so the ratings variables need to be numeric. The raw data file Pizza. csv has variables for the respondent’s ID, and the ratings for five different toppings: arugula, pine nuts, roasted butternut squash, shrimp, and grilled eggplant. The first two digits in the ID correspond to the month of the survey.\