Relative frequencies
 |
 |
 |
 |
 |
Calculating relative frequencies
Question B
A bag contains 50 coloured marbles.
This table shows how many marbles of each colour are in the bag.
| Colour | Red | Yellow | Orange | Green | Blue |
|---|---|---|---|---|---|
| Number | 10 | 5 | 20 | 5 | 10 |
a One marble is picked at random from the bag.
What is the probability of it being red or yellow or orange?
b One marble is picked at random from the bag.
What is the probability of it being blue or green?
 |
 |
 |
© Australian Mathematical Sciences Institute, except where indicated otherwise. This material is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0) licence http://creativecommons.org/licenses/by-nc/3.0/
