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Created by Mr. Lafferty Maths Dept. Probability Basic Probability www.mathsrevision.com 16-Feb-19 Created by Mr. Lafferty Maths Dept.

Created by Mr. Lafferty Maths Dept. Starter Questions www.mathsrevision.com 16-Feb-19 Created by Mr. Lafferty Maths Dept.

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. www.mathsrevision.com 3. Write in fraction form. 16-Feb-19 Created by Mr. Lafferty Maths Dept.

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 ......... www.mathsrevision.com P(Event) = the number of favourable events compared to the total number of events. 16-Feb-19 Created by Mr. Lafferty Maths Dept.

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) www.mathsrevision.com 16-Feb-19 Created by Mr. Lafferty Maths Dept.

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 6 (1,2,3,4,5,6,) www.mathsrevision.com So probability is P(4) = 1 in 6 chance 16-Feb-19 Created by Mr. Lafferty Maths Dept.

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 6 (1,2,3,4,5,6,) www.mathsrevision.com 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.

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. www.mathsrevision.com 16-Feb-19 Created by Mr. Lafferty Maths Dept.

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) www.mathsrevision.com Are you on Target ? I can ? 16-Feb-19 Created by Mr. Lafferty Maths Dept.