Revision of probability

• Mathematics
• Lower Secondary (Key Stage 3)

Revision of probability

Take some counters (red and yellow). Upload a photo of them below. What is the probability you will pick a yellow counter?

Complete task 1 on task sheet and upload a photo of answers here.

What is the probability you will roll a 2 on a fair sided dice?

1. 2/6
2. 1/6

wordwall.net

There are 10 marbles in a bag. 5 are red, 4 are green, 1 is blue. If I choose a marble at random, what is the probability I get green?

1. 4/10
2. 2/5

College attendance is recorded as either on time or late. A student is late 6 days out of a possible 40. What is the probability they are on time?
(Challenge task: give your answer as a percentage)

How to measure probability

We will revise probability scales

mathigon.org

It is going to rain for 12 days out of the next 20. Express this as a probability then draw on a PB scale.

Probability of more than one event

Tree diagrams

I have 7 yellow counters and 3 red. You have 2 yellow counters and 8 red. What is the probability of us both picking yellow counters?

Complete task sheets on tree diagrams and upload here.

Tell me one thing you have learned about probability today.