This document defines probability and explains how to calculate and represent probabilities using fractions, decimals, and percentages. It provides examples of calculating probabilities for events like rolling dice, picking from a hat, and drawing candies with or without replacement. Key points are that probability is a measurement between 0 and 1 that represents the likelihood of an event occurring, and it can be calculated by taking the number of ways the event can occur divided by the total number of possible outcomes.

1. By: Christie PotterProbabilitiesBailey Weaver “88 Kings and Queens” Oct 25, 2009 via Flickr, Creative Commons Attribution

2. What is a probability?Three major pointsAn experiment (Situation)An outcome (Result)An event (Single Result)Probability=measurement of a single event occurring

3. 0=NO chance of the probability occurring

4. In Between = represented with fractions, decimals, & percent

5. 1=the probability WILL occur0-1 Probability

6. Using Fractions, Decimals, & PercentPercent: 0-100% probability

7. Decimal: 0.0-1.0 probability

8. Fraction: 0/1 - 1/1 probability

9. Each can be interchangeableStarting At A PercentExample: 20%Fraction 20/100 can be SIMPLIFIED to 1/5

10. Decimal 20% DIVDED by 100% = .2Example: ¾Percent ¾ is EQUAL to 75/100 or 75%

11. Decimal  3 DIVIDED by 4 equals .75Starting At A Fraction

12. Example: .5Percent .5 MULTIPLIED by 100 = 50%

13. Fraction  50/100 can be SIMPLIFIED to ½ Starting At A Decimal

14. Probability of an Event# of ways event can occur P (A) = total # of possible outcomesWhere A = The Event

15. IF P (A) > P (B)

16. THEN A is more likely to occur

17. IF P(A) = P(B)