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

Age Number of Customers
57
20-30 87
30-40 100
40-50 77
50-60 51
99


One customer is chosen at random for a prize giveaway.

What is the probability that the customer is at least 40 but no older than 60?


What is the probability that the customer is either older than 60 or younger than 40?


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


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