We use the data collected in surveys to make 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.
|
Sport |
Number of students |
|
Basketball
Cricket
Football
Netball
Tennis |
34
10
44
60
52 |
|
Sum |
200 |
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
|
