Finding a Conditional Probability
A phone company surveys a sample of current
customers to determine if they use their phones most
often to text or use the Internet. They sort the data by
payment plans, as shown below.
Plan A: 27 text, 21 Internet
Plan B: 13 text, 10 Internet
Answer the questions to determine a conditional
probability
How many customers are on payment plan B?
customers
How many of the customers on plan B text?
customers
What is the probability that a randomly selected
customer who is on plan B uses the phone most often
to text? Give the answer in fraction form.