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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.

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?

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Solution:

1. Probability is = number of favorable outcomes/total number of possible outcomes.

Here, the number of favorable outcomes = 30+90 => 120

Total number possible outcomes = 400

The required probability = 120/400 => 0.3

Answer: 0.3

2. What is the probability ...

$2.19