Question

At a large high school, it is estimated that two out of every three students have a cell phone, and one in five of all students have a cell phone that is one year old or less. Out of the students who own a cell phone, what proportion owns a phone that is more than one year old?

Option 1: 1/2
​Option 2: 1/3
​Option 3: 2/3
​Option 4: 4/5

Answer 1

Two out of every three students have a cell phone and one in five of all students have a cell phone that is one year old or less. Therefore, the proportion of students who own a cell phone that is more than one year old is 4/5.

Step-by-step explanation:

To find out what proportion of students own a cell phone that is more than one year old, we need to consider the information given about the overall number of students who have a cell phone and the number of students who have a cell phone that is one year old or less.

We know that two out of every three students have a cell phone, which means the proportion of students who don't have a cell phone is 1/3. Out of the students who have a cell phone, one in five has a phone that is one year old or less, which means the proportion of students who have a phone that is more than one year old is 4/5. Therefore, Option 4: 4/5 is the correct answer.