IXL - Calculate probabilities of events (Precalculus practice)

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

be the event "the outcome is greater than 3". Find

(

)

Outcome	Probability
1	0.3
2	0.3
3	0.1
4	0.3

ref_doc_title.

Learn with an example

question

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

be the event "the outcome is greater than 3". Find

(

)

Outcome	Probability
1	0.1
2	0.5
3	0.1
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 greater than 3", so find the set of possible outcomes that are greater than 3.

Outcome

{4}

Find

(

)

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

(

)

(

)

0.3

Looking for more? Try this:

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

Time
elapsedTime

hr	min	sec
00	00	04

SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

Teacher tools

Work it out

Not feeling ready yet? This can help:

DD.1Identify probability distributions

Excellent! You got that right!

Jumping to level 1 of 1

Excellent!