Calculating a theoretical probability
Calculating a theoretical probability.
- Probability = favourable outcomes ÷ all outcomes when individual outcomes are equally likely.
- A probability lies between 0 and 1; complementary probabilities sum to 1.
- Experimental relative frequency estimates probability and can vary between samples.
Example 1
A bag contains 2 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Example 2
A bag contains 3 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Your turn
A bag contains 4 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Check answer
A bag contains 5 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Check answer
A bag contains 6 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Check answer
A bag contains 7 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Check answer
A bag contains 8 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
Check answer
A bag contains 4 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
A bag contains 5 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
A bag contains 6 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
A bag contains 7 red counters and 6 blue counters. Each counter is equally likely to be selected. Find
A bag contains 8 red counters and 6 blue counters. Each counter is equally likely to be selected. Find