A small store keeps track of the number X of customers that make a purchase during the first hour that the store is open each day. Based on the records, X has the following probability distribution.X = 0, P(X) = 0.1 ... X = 1, P(X) = 0.1 ... X = 2, P(X) = 0.1 ... X = 3, P(X) = 0.1 ... X = 4, P(X) = 0.6The density curve for a continuous random variable X has which of the following properties?
