PSAT Math Grid-Ins Question 3: Answer and Explanation
Question: 3
Estimated Numbers of Cell Phone Users by Type (in millions)
| Prepaid users | Contracted users | Total | |
| 2008 | 45 | 225 | 270 |
| 2012 | 75 | 250 | 325 |
| Total | 120 | 475 | 595 |
If a cell phone user is selected at random in 2008, what is the probability that user is a contracted user?
Correct Answer: 5/6
Explanation:
The question asks for the probability that a cell phone user selected at random in 2008 is a contracted user. Probability is defined as 
. Read the table carefully to find the numbers for the top and bottom of the fraction. The number of contracted users in 2008 is 225. The total number of users in 2008 is 270. The probability is 
, which reduces to 
. The correct answer is .
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