Probability Review

Probability Review

By Ardre'ian Ervin

Probability Intro part 1

Subject | Subject

Some text here about the topic of discussion

Probability intro Part 2

Some text here about the topic of discussion

Probability Number Line

7th Grade | Math

7.6H & 7.6I

​Probability with coins

Multiple Choice

James is flipping a coin. He says there is less than a 50% chance that it will land heads this time because it landed heads on his last coin toss. Which of these is true?

• James is right, there is less than a 50% chance of landing on heads this time.

• James is wrong, there is more than a 50% chance of landing on heads this time.

• James is wrong, no matter how many times you flip a coin, heads will always be 50%.

When coming up with the probability of an outcome, divide the outcome you're looking for by the total number of possible outcomes. In a coin toss, the probability of either side is 1 ⁄ 2, as there are two total outcomes. With dice, which have six sides, the probability of one of the numbers landing on top is 1 divided by 6, or 1 ⁄ 6.

The probability of an outcome

Multiple Choice

Stephen has three sweaters: one is blue, one is red and one is green. He pulls a sweater out of his dresser at random. What is the probability that it is his green sweater?

• 1/3

• 3

• 1/4

And when I see the word "or"

"Or" in Probability means to add all possible events together !​

Multiple Choice

What is the probability of rolling an even number on a die?

• 3/6

• 1/2

• 3

​Compound Events

Subject | Subject

Some text here about the topic of discussion

More about compound events

Multiple Choice

• A

• B

• C

• D