Дисперсия альтернативного признака равна _ вероятностей наличия признака и его отсутствия

Take two slices of your favorite bread.Put mustard on the bottom slice of bread,and mayo on the top slice.Choose your cheese for the sandwich.Lay tomatoes in the same manner as the cheese, depending on if you want one or two slices.Put a few leaves of lettuce on top of the tomatoes, making sure it hangs off all four edges of the sandwich.Lay two slices of thin ham on top of the lettuce.Lay the slice of bread with mustard on top of the sandwich, finishing it off.Serve the sandwich on a medium sized plate.