SME
Grade 7 Math
Probability of simple and compound events
The main lesson, then each kind of problem it solves.
Probability of simple and compound events
Main lesson
A bag of marbles
Use this for “A bag has 5 red, 3 blue and 2 green marbles. What is the chance of blue?”
Expected results in the long run
Use this for “3 of 8 sectors are prizes. In 240 spins, about how many prizes?”
Two dice
Use this for “Two dice are rolled. What is the chance the sum is 7?”
Two dice: a sum of at least
Use this for “Two dice are rolled. What is the chance the sum is at least 10?”
Tree diagram
Use this for “A coin is flipped and a spinner with 3 sectors spun. How many outcomes are there, and what is the chance of heads (A) and 2?”
Tree diagram with three stages
Use this for “A coin is flipped three times (A = heads, B = tails). What is the chance of heads all three times?”
How likely is it?
Use this for “Is a probability of 0.28 likely or unlikely?”