store gathers some demographic information from their customers. The following chart summarizes the age-related information they collected: Age Number of Customers

 store gathers some demographic information from their customers. The following chart summarizes the age-related information they collected:

One customer is chosen at random for a prize giveaway.


What is the probability that the customer is at least 20 but no older than 50?


What is the probability that the customer is either older than 50 or younger than 20?


What is the probability that the customer is at least 50?


Enter your answers as either decimals or fractions,not as percents.