26


Chance


We are learning to: Create frequency charts. and percentages.


Estimate the likelihood of occurrence of events using fractions Identify and list all possible outcomes of simple random processes. Day One Study the steps used to solve the problem in the example below.


Kevin orders a 12-slice pizza special. It has 6 slices with pepperoni, 2 slices with chicken, 1 slice with ham and 3 slices with meatballs. If there is a power cut just before he opens the box, what is the likelihood that he will pick up a slice with meatballs?


Circle the numbers and keywords: 12, 3, likelihood Link with operation needed (+, −, × or ÷): None Use a strategy: Simplify and use logical reasoning.


Estimate and calculate: My estimate: This is less than half of the pizza.


3 out of every 12 slices have meatballs. Simplify:


1 in 4 = 1 4 = 25% = 0.25


Summarise and check how you got your answer: I simplified 3 in 12 to become 1 in 4.


Try these. 1


Answer: 2


Find the probability of selecting a county on the island of Ireland that is in Leinster. Write your answer in its lowest terms.


Marks: /2


Find the probability of selecting a county on the island of Ireland with three syllables in its name. Write your answer as a percentage.


Answer: 3 Marks:


Find the probability of selecting a county in Ulster that is in Northern Ireland. Write your answer as a fraction and a percentage.


Answer: 108 Strand: Data Strand Unit: Chance Marks: /2 Today’s Marks: /6 /2


Answer: There is a 1 in 4 chance.


Northern Ireland


Week 26


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