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

$\backslash$table$[[$Age$,$Number of Customers

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 $60?$

What is the probability that the customer is either older than $60$ or younger than $20?$

What is the probability that the customer is at least $60?$