Year 8 Interactive Maths - Second Edition

Predictions

Example 1

A survey was conducted using 200 randomly selected students from across the state to investigate which of 5 sports is played more often?  The question put to each student was which sport out of basketball, cricket, football, netball and tennis do you play more often?  The tabulated results appear below.          

If the results give a fair indication of how all students in the state would have answered the survey question, calculate the probability that any randomly selected student from the state plays the following sport the most?
a.  Basketball
b.  Cricket
c.  Football
d.  Netball
e.  Tennis

Solution:

That is, the sum of the probabilities of all events is equal to 1.

Key Terms

prediction, sum of all probabilities