This document defines probability and explains how to calculate it using fractions, decimals, and percentages. It provides examples of calculating probabilities for events like rolling dice, drawing from a hat, and selecting 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 expressed as a fraction 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)