A local fast-food restaurant is running a "Draw a three, get it free" lunch promotion. After each customer orders, a touchscreen display shows the
message "Press here to win a free lunch." A computer program then simulates one card being drawn from a standard deck. If the chosen card is a 3,
the customer's order is free. Otherwise, the customer must pay the bill.
On the first day of the promotion, 250 customers place lunch orders.
1.) The total number of trials n =
2.) The probablity of success on each trial p =
3.) What is the probability that 10 customers win a free lunch?
4.) What is the probability that 20 customers win a free lunch?
