SME
Grade 7 Math
Statistics & Probability
Random sampling and population inferences
Main lesson
Compare two samples
Use this for “Which class read longer last night, and by how much?”
Random sample or not?
Use this for “Which way of choosing students gives a random sample of the school?”
Sample means vary
Use this for “Many samples of 30 apples each give a mean weight. What does the spread of the means say?”
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?”