IXL - Theoretical and experimental probability (Geometry practice)

You pick a card at random.

What is P(4 or less than 5)?

Simplify your answer and write it as a fraction or whole number.

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Learn with an example

question

You flip a coin.

What is P(tails or heads)?

Simplify your answer and write it as a fraction or whole number.

key idea

Mutually exclusive events can never occur at the same time. If A and B are mutually exclusive, then:

P(A or B) = P(A) + P(B)

solution

The events tails and heads are mutually exclusive. It's impossible for a coin flip to be both at the same time.

Find P(tails). Flipping a coin has two possibilities: heads or tails.

P(tails)

Find P(heads).

P(heads)

Find P(tails or heads).

P(tails or heads)

= P(tails) + P(heads)

Write your answer in simplest form.

P(tails or heads) = 1

Looking for more? Try these:

Lesson: Probability

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Teacher tools

Work it out

Not feeling ready yet? These can help:

KK.1Theoretical probability

KK.2Experimental probability

H.1Convert between percents, fractions, and decimals

Lesson: Probability

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