Mathematics Probability Conceptual 11–13 yrs

Complementary events

互补事件

Description

Understand and apply the rule that probabilities of all mutually exclusive outcomes sum to one; use this to find the probability of a complementary event (P(not A) = 1 − P(A))

Mastery Evidence

✓ Verify that probabilities of all outcomes listed for a spinner sum to 1
✓ Calculate the probability of NOT rolling a 6 as 1 − 1/6 = 5/6
✓ Identify an error in a probability distribution where the values do not sum to 1

Assessment Prompt

If a spinner has three sections and one has a probability of 0.4 and another has 0.35, can your child work out the probability of landing on the third section without being told?