One-Way Tables

One-Way Tables

Basic, GCSE(F),

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 normally show a total, although a total is required to work out the probability of an even happening.


1. A die was rolled twenty times. The results were plotted onto a one-way table:


Which value appeared the least often?

Answer: 4

There were only 2 instances with a value of 4; the other values appeared more often.

2. 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?


Answer: 4

there were only half as many red cars as white cars; therefore there were 4 red cars.