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We use the data collected in surveys to make predictions.
Example 1
A survey was conducted using 200 randomly selected students to
investigate the mode of transport to school. The question put to
each student was what mode of transport do you use more often?
- Bus?
- Car?
- Bicycle?
- Train?
- Walking?
The results were tabulated as follows:
| Mode
of transport to school |
Number
of students |
|
Bus
Car
Bicycle
Train
Walking |
20
50
38
12
80 |
|
Sum |
200 |
If these results give a fair indication of how all students in the
state would have answered the survey question, calculate the probability
of any one student in the state using the following mode of transport the
most:
a. Bus
b. Car
c. Bicycle
d. Train
e. Walking
Solution:
That is, the sum of the probabilities of all events is equal to 1.
Key Terms
predictions |
