Convert the probability to odds in favour.

Total possible outcomes = favourable outcomes + unfavourable outcomes

7 = 4 + unfavourable outcomes

3 = unfavourable outcomes

odds in favour = number of favourable outcomes : number of unfavourable outcomes

 

A probability of converts to 4:3 odds in favour.

 

Convert 10:1 odds against to probability.

odds against = number of unfavourable outcomes : number of favourable outcomes

= 10:1

Total possible outcomes = 10 + 1 = 11

10:1 odds against converts to a probability of 0.091.

 

Read page 144-145 Examples 2 and 3 in your textbook, Principles of Mathematics 12.

Complete the Your Turn questions on page 144 (a & b) and page 145 for more practice in converting between odds and probability.

Click here to verify your answers .