IXL - Probability of independent and dependent events (Geometry practice)

You roll a 6-sided die two times.

What is the probability of rolling a prime number and then rolling a prime number?

Write your answer as a percentage.

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Learn with an example

question

You flip a coin twice.

What is the probability of getting heads and then getting tails?

Write your answer as a percentage.

key idea

Two events are independent if the outcome of the first event does not affect the outcome of the second event.

solution

The events heads and tails are independent. The first flip does not affect the second flip.

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

P(heads)

Find P(tails).

P(tails)

Find the probability of getting heads and then getting tails. Multiply P(heads) by P(tails).

P(heads) x P(tails)

Write your answer as a decimal. Then convert your answer to a percentage.

0.25

25%

The probability of getting heads and then getting tails is 25%.

Looking for more? Try these:

Lesson: Compound probability

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AA.3Identify independent and dependent events

Lesson: Compound probability

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