Probability

Probability

1. 0 < P < 1

   • Fractions/Decimals/ Percentages
   • 0 = impossible / 1 = certain

2. Mutually exclusive outcomes

   • The 'OR' Rule
     • P(A or B) = P(A) + P(B)
     • P(not A) =1 - P(A)

3. To find the numbe of outcomes when there is more than one event

   • Sample space diagrams

4. Estimating probability

   • Number of outcomes/ total number of possible outcomes

5. Expected number of outcomes

   • estimated probability x no of events

6. Independent events

   • P (A AND B) = P(A) x P(B)

7. Probability trees

   • Conditional probability