IXL - Calculate probabilities of events (Algebra 2 practice)

The table gives a set of outcomes and their probabilities. Let

be the event "the outcome is greater than 2". Find

(

)

Outcome	Probability
1	0.1
2	0.5
3	0.4

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Learn with an example

question

The table gives a set of outcomes and their probabilities. Let

be the event "the outcome is less than or equal to 1". Find

(

)

Outcome	Probability
1	0.2
2	0.2
3	0.3
4	0.3

key idea

A sample space is a set of possible

outcomes.

An event is a set of outcomes in a sample space. If

is an event, then

(

)

is the probability that

occurs.

The probability of an event is the sum of probabilities of the outcomes in that event. If there are no outcomes in an event, the probability of that event is zero.

solution

Find the outcomes in event

is the event "the outcome is less than or equal to 1", so find the set of possible outcomes that are less than or equal to 1.

Outcome

{1}

Find

(

)

To find the probability of an event, add the probabilities of the outcomes in it.

(

)

(

)

0.2

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PP.1Identify probability distributions

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