Question

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. _____

Answer 1

1) 23 customers

2) 13 customers

3) 13/23

Explanation:

Answer 2

13 customers use to text,

10 customers use the Internet,

the probability that a randomly selected customer who is on plan B uses the phone most often to text is
`(13)/(23)`

Explanation:

A phone company surveys a sample of current customers to determine if they use their phones most often to text or use the Internet.

Plan B:

13 customers use to text,

10 customers use the Internet,

23 customers in total.

The probability that a randomly selected customer who is on plan B uses the phone most often to text is

`(13)/(23)`