Step 6 Objective

Know that if the probability of an event occurring is p, then the probability of it not occurring is 1 – p.


Examples of what pupils should know and be able to do

happy learners

Pupils should be able to answer questions such as:

Given a set of snooker balls (15R, Y, G, Br, Bl, P, BK), if one ball is chosen at random what is the chance that it is:

  1. red?
  2. not red?
  3. black?
  4. not black?