Numeracy Worksheet - Castlebrae Community High School - 2012 Page 44
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47FHS Numeracy
contents page
Probability
Probability is a measure of how likely or unlikely an event is of
happening. It is measured on a scale of 0 (impossible) to 1 (certain).
Impossible
Evens
Certain
50/50 chance
likely
unlikely
0
0.5
1
Level 2
P(event) = number of favourable outcomes
total number of outcomes
Example 1
What is the probability of rolling a 4?
Level 3
P(4) = 1
6
Example 2
What is the probability of rolling an even number?
(2, 4, 6)
Level 3
P(even number) = 3 = 1
6
2
Example 3
What is the probability of rolling number greater than 2?
(3, 4, 5, 6)
Level 3
P(>2) = 4 = 2
6
3
Probabilities can be expressed as a FRACTION or a DECIMAL and
Level 3
even if we want as a percentage.
Example 4
What is the probability of a tail when you toss a coin?
Level 3
P(tail) = 1 = 0.5
2
When making choices we need to consider:
the element of risk,
the probability of the event happening and
the consequences of the event happening.
44
L Watson 2012
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