# Simple Probability

## Grade 7 Math Worksheets

### Probability means a chance of something happening.

See the statements below:

It will * probably *be a cold day today.

* Most probably*, Daniel will score 80% in his Math test.

There is a * chance* that my sister visits me today.

In all the statements above, there is a statement of uncertainty because words like “probably”, “most probably”, “chance” indicate that the event may or may not happen.

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*Example:*When a coin is tossed, there are two possibilities – head or tail.Probability of getting a head =

Probability of getting a tail =

*Example: *When a die is thrown, it can show a 1, 2, 3, 4, 5 or 6.

Probability of getting a 1, 2, 3, 4, 5 or 6 =

** Probability** of an event is the number of ways an event can occur divided by the total number of possible outcomes.

*Example:* What is the probability of spinner landing on pink region?

In all there are 8 parts in the spinner.

So, probability of spinner landing on pink part =

**Check Point**

- There are 4 green, 3 yellow and 2 red marbles in a bag. What is the probability of picking a green marble
- Shannon has 5 white erasers and 3 green erasers. What is the probability of picking a white eraser if he picks up any eraser randomly?
- When a die is thrown, what is the probability of getting an odd number?
- What is the probability of spinner landing on 4?

- What is the probability of picking a red card from a deck of 52 cards?

##### Answer key

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