1. Created by Mr. Lafferty Maths Dept.
Probability
Basic Probability
16-Feb-19
Created by Mr. Lafferty Maths Dept.

2. Created by Mr. Lafferty Maths Dept.
Starter Questions
16-Feb-19
Created by Mr. Lafferty Maths Dept.

3. Created by Mr. Lafferty Maths Dept.
Probability
Learning Intention
Success Criteria
We are learning how to calculate basic probability.
Understand the term
probability.
Calculate the probability of an event happening.
3. Write in fraction form.
16-Feb-19
Created by Mr. Lafferty Maths Dept.

4. Probability www.mathsrevision.com Calculating Ratio Probability
One way of thinking about Probability is as a ratio
Chance of an event happening is
1 in
P(Event) = the number of favourable events
compared to the total number of events.
16-Feb-19
Created by Mr. Lafferty Maths Dept.

5. Created by Mr. Lafferty Maths Dept.
Probability
Calculating Probability
Probability can be thought of as a simple fraction or decimal.
It always lies between 0 and 1.
0 meaning impossible ( could not happen)
1 meaning certain ( will definitely happen)
16-Feb-19
Created by Mr. Lafferty Maths Dept.

6. Created by Mr. Lafferty Maths Dept.
Probability
Calculating Ratio Probability
Example : What is the chance of getting a 4 when rolling a dice.
The number of favourable events is 1
The number of total events is (1,2,3,4,5,6,)
So probability is
P(4) = 1 in 6 chance
16-Feb-19
Created by Mr. Lafferty Maths Dept.

7. Created by Mr. Lafferty Maths Dept.
Probability
Example : What is the chance of getting an odd when rolling a dice.
The number of favourable events is 3 (1,3,5)
The number of total events is (1,2,3,4,5,6,)
So probability is
P(odd) = 3 in 6 chance
Simplify
HCF = 3
P(odd) = ½
P(odd) = 1 in 2 chance
16-Feb-19
Created by Mr. Lafferty Maths Dept.

8. Created by Mr. Lafferty Maths Dept.
Probability
Calculating Probability
Example : A boy tossed a coin.
What is the probability that it is heads.
Example : There are 3 red and 4 green balls in a bag.
What is the probability a green ball is picked.
16-Feb-19
Created by Mr. Lafferty Maths Dept.

9. Probability Now try TJ4+ Ex 24.1 Ch24 (page 200) www.mathsrevision.com
Have you updated your Learning Log ?
Probability
Now try TJ4+
Ex 24.1
Ch24 (page 200)
Are you on Target ?
I can ?
16-Feb-19
Created by Mr. Lafferty Maths Dept.