Question: At the McDonald's in West Anchorage, Alaska 15% of the customers order a sandwich with zero toppings, 30% order a sandwich with one topping, 20% order a sandwich with two toppings, 13% order a sandwich with three toppings, 14% order a sandwich with four toppings and 8% order a sandwich with five toppings. Estimate the Mean, Variance and Standard Deviation of extra toppings.