Solve the following problem:
Q: A survey of 400 customers was completed in an attempt to measure the number of cups of coffee ordered during business hours versus those ordered during non-business (pleasure) hours. They also recorded how many items were purchased during the transaction. Results are as follows:
Customer 0 extra 1 extra 2 extra 3 or more Total
Business 50 60 30 10 150
Pleasure 20 80 90 60 250
Total 70 140 120 70 400
1. What is the probability that a customer orders exactly 2 extra items?
2. What is the probability that a customer who responded to the survey was a business customer?
3. What is the probability that a customer ordered fewer than 2 extra items?
4. What is the probability that a customer visited during business hours or ordered exactly 1 extra item?