# SP 8.2.1

I can understand the probability of independent events with objects, pictures, and symbols (numbers).

**Why it's important:**

**Why it's important:**

In the media, you hear and read statements about the probability of everyday events, such as living to be 100 or winning the lottery. To make sense of these statements, you need to understand probability.

**Probability**

**Probability**

**Probability** is the chance that something will happen, or how likely it is that some event will happen.

Sometimes you can measure a probability with a number - "There is a 90% chance of rain" - or you can use words - "It will likely to rain tomorrow."

**In general:**

Probability of an event happening = Number of favourable outcomes/ Total number of outcomes

**Listing outcomes**

**Listing outcomes**

An * outcome *is a possible result of an experiment.

**What are the possible outcomes?**

**What are the possible outcomes?**## Theoretical vs. experimental probability

**Theoretical probability**

**Theoretical probability**

What we call "probability"; You find the probability by * analyzing* the possible outcomes rather than by

*. It is what we*

**experimenting***to happen based on the numbers.*

**expect****Twenty counters were put in a bag:**

7 green, 6 black, 5 orange, and 2 purple.

You reach into the bag to pull out a colour counter.

In * theory*, what is the probability of you picking:

a **green** counter from the bag?

a **black** counter from the bag?

an **orange **counter from the bag?

a **purple **counter from the bag?

What * actually *happened when you conducted the experiment?

Experimental probability is the * result* of conducting an experiment or playing a game.

**Experimental probability**

**Experimental probability**

Assignment 2 (you are to do all of the pages that go along with this assignment as well. Please correct them.)