Dont understa 25 pts who can help answer this

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

What is mean median mode and range?

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad