1. Data, Probability, Circle Graphs

2. A Quick Review… 5, 8, 9, 3, 10  Mean – The average. (Add all the numbers in your data set, and divide by the total number of numbers in the data set.)  (5+8+9+3+10)/ 5 = 7  Median – Middle number in a data set. (Order from least to greatest… it is the number in the middle.)  3, 5, 8, 9, 10 … = 8  Mode – The most commonly occurring number in the data set.  No answer, no numbers are repeated.  Range – Take the biggest number and subtract the smallest number from it to find the range.  10-3 = 7

3. Probability… What you need to know!  Probability – The likelihood that an event will happen.  Theoretical Probability - Probability of an event happening, “in theory” or logically. P(event) = the number of favorable outcomes total number of possible outcomes EXAMPLE: The odds of throwing a dice and getting a 4. P(event) = 1 6

4. Probability… More you need to know!  Experimental Probability - Probability of an event happening, based on an experiment performed. P(event) = number of times an event happens total number of trials EXAMPLE: The number of times a 4 is rolled, when a dice is tossed a total of 25 times. A 4 is rolled 5 of the 25 times the dice is tossed. P(event) = 5 = 1 25 5

5. How to make a Circle Graph… (Part 1)  A class is given a survey related to their favorite pets. The results are given in the frequency table below. PetFrequency“Fraction” it Occurs Do the Math… (multiply by 360) Degrees of Circle Dog75/20 =.35.35 * 360126 Cat3 Fish5 Turtle5 TOTAL:20----------360 Extension Added to Frequency Table

6. How to make a Circle Graph… (Part 2)  Draw a circle… Hint: Use your protractor to do this!  Use your protractor to make each of the sections of your bar graph the appropriate number of degrees (as shown in your extended frequency table).  Create a key for the Circle Graph (patterns or colors) AND/OR Label the Circle Graph itself.  Include a title!!! 108 Degree Example

7. How to make a Circle Graph… (Part 3)