Information about Experimental Probability can be captured in a number of different ways. If there is only one piece of information being captured, such as the roll of a dice, or the colour of cars on a motorway, then the information can be captured in a One-Way table.
One-way tables can be shown either vertically or horizontally.
One-way tables do not always show a total, although a total is required to work out the probability of an event happening.
A die was rolled twenty times. The results were plotted onto a one-way table:
| Throw | 1 | 2 | 3 | 4 | 5 | 6 |
| Frequency | 3 | 4 | 4 | 2 | 3 | 4 |
Which value appeared the least often?
There were only 2 instances with a value of 4; the other values appeared more often.
Answer: 4
A survey of cars along a road was recorded in a notebook. The entry for the number of Red cars was obliterated by rain. If it was known that `frac(1)(4)` of the cars were white, and that an `frac(1)(8)` of the cars were red.
How many red cars were there?
| White | Red | Blue | Green | Black | Silver |
| 8 | ? | 7 | 5 | 3 | 5 |
There were only half as many red cars as white cars; therefore there were 4 red cars.
Answer: 4