Percents And Probability Worksheet With Answers - Lesson 12-19 Page 7
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49PrOBaBility
Lesson 13
A
referee fl ipped a fair coin to decide which football team would start the game with
the ball. Th e coin was just as likely to land “heads” as “tails”. Which way do you think
the coin landed?
Carl rolled a number cube and it landed on “4”. Th ere are 6 numbers on a number cube.
Do you think he will roll a 4 on his next turn?
It is impossible to know for sure whether the coin will land heads or if the number cube
will land on 4. However, you can use probability to see how likely it is each one will occur.
Probability
measures how likely it is an event will occur.
Outcomes
are the possible results you can have from a probability experiment. If you fl ip
a coin, it can land heads or tails. If you roll a number cube, you can roll a 1, 2, 3, 4, 5 or 6. Th ese are possible
outcomes. An
event
is a desired outcome. For example, if you want to roll a 4, the event would be rolling a 4.
Probabilities are measured on a scale from 0 to 1. A probability of zero means the event will never occur.
A probability of one means the event will always occur.
Probability
1 _
1 _
3 _
, 0.25
, 0.50
, 0.75
0
1
4
2
4
or
0%
or
25%
or
100%
or
50%
or
75%
Impossible
unlikely
equally likely
Likely
Certain
It is equally likely that a fl ipped coin will land heads or tails. Rolling a 9 on a number cube is impossible
since you can only roll a 1, 2, 3, 4, 5 or 6. Instead of using words to describe probability, a ratio can be
written to describe theoretical probability.
Th eoretical probability
is the ratio of favorable outcomes to
the possible outcomes.
Th e notation P( ) is used for probabilities. Th e probability that Carl rolls a 4 with the number cube can be
written P(4). Th is is read, “Th e probability of rolling a 4. ”
77
Lesson 13 ~ Probability
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