15 Relative Frequency And Probability Examples And Worksheets - Maths Quest General Maths Preliminary Course Page 27
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Relative frequency
•
Relative frequency describes how often an event has occurred.
•
It is found by dividing the number of times an event has occurred by the total number of trials.
Single event probability
•
The probability of an event can be found using the formula:
number of favourable outcomes
P(event) =
total number of outcomes
•
Probabilities are usually written as fractions but can also be expressed as decimals or percentages.
Range of probabilities
•
Probabilities range from 0 (impossible) to 1 (certain). The use of a fraction for a probability can help us
describe, in words, the chance of an event occurring.
Complementary events
•
The complement of an event is the event that describes all other possible outcomes to the probability
experiment.
•
The probability of an event and its complement add to give 1.
•
The probability of an event can often be calculated by subtracting the probability of its complementary event
from 1.
505
Chapter 15
Relative frequency and probability
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