WELCOME TO MATH!

Above is a picture of a spinner with three equal sections.
►If I spin the spinner on this diagram, do I have an equal chance of getting a 2 as of getting a 1?
Yes, I do, because each number is represented by the same-sized section.
►Do I have a better chance of getting an odd number or an even number?
I have a greater chance of getting an odd number, because two of the three sections contain odd numbers.

Please open your Math textbook to page 244 and read what it says about probability, event, and outcome.

►How many sections does the spinner on p. 244 have? (4)
►What can you say about the sections? (They are of equal size and are numbered 1-4.)
Because the sections are equal in size,  the pointer is equally likely to land on one number as any other.

►Do you see that there are four possible outcomes on the spinner? (1, 2, 3, 4)
►For the event "landing on 2," there is only one way to get a 2. (The pointer actually landing on 2.)
►The probability of an event is the number of ways to get the desired event out of the number of all possible outcomes.
We said there is only one way to get a 2, and that is to land on it.
We also said there are four possible outcomes, or places the spinnder could land.
That means the probability of getting a 2 is "1 out of 4.

►GO BACK AND LOOK AT THE SPINNER AT THE TOP OF THIS PAGE.
►Am I equally likely to get a 2 as to get a 1? (Yes.)
►What is the probability of getting a 2 on this spinner? (1 out of 3.)

Lastly, there are IMPOSSIBLE events. Looking at the spinner on page 244, can the pointer land on a 5? (No. There are no ways to spin a 5.) The event is impossible.

Please read about "Possible / certain / more likely / less likely" events on page 244.

Let's do Problems #1 & #2 on page 245 together:
1. The dice has six sides, each with a number on it, so the possible outcomes are: 1, 2, 3, 4, 5, 6
2. Yes, the outcomes are equally likely because each has a 1 out of 6 chance of happening.

YOUR TURN! Please complete problems 1 - 9 on page 245.
 

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