Lesson 12-8 Pages 646-649 Odds. What you will learn! 1. How to find the odds of a simple event.

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Presentation transcript:

Lesson 12-8 Pages Odds

What you will learn! 1. How to find the odds of a simple event.

Odds

What you really need to know!Odds The odds in favor of an outcome is the ratio of the number of ways the outcome can occur to the number of ways the outcome cannot occur The odds against an outcome is the ratio of the number of ways the outcome cannot occur to the number of ways the outcome can occur

Example 1: Find the odds of a sum greater than 5 if a pair of number cubes is rolled. 1,12,13,14,15,16,1 1,22,23,24,25,26,2 1,32,33,34,35,36,3 1,42,43,44,45,46,4 1,52,53,54,55,56,5 1,62,63,64,65,66,6

Example 1: There are 26 rolls that are greater that 5. 1,12,13,14,15,16,1 1,22,23,24,25,26,2 1,32,33,34,35,36,3 1,42,43,44,45,46,4 1,52,53,54,55,56,5 1,62,63,64,65,66,6

Example 1: There are 10 rolls that are 5 or less. 1,12,13,14,15,16,1 1,22,23,24,25,26,2 1,32,33,34,35,36,3 1,42,43,44,45,46,4 1,52,53,54,55,56,5 1,62,63,64,65,66,6

Example 1: 26:10 which means 13:5 1,12,13,14,15,16,1 1,22,23,24,25,26,2 1,32,33,34,35,36,3 1,42,43,44,45,46,4 1,52,53,54,55,56,5 1,62,63,64,65,66,6

Example 1b: A bag contains 5 yellow marbles, 3 white marbles, and 1 black marble. What are the odds against drawing a white marble from the bag? There are 6 marbles that are not white. 6 : 3 which means 2 : 1

Example 2: After 2 weeks, 8 out of 20 sunflower seeds that Tamara planted had spouted. Based on these results, what are the odds that a sunflower seed will sprout under the same conditions. ABCD 2 to 5 5 to 2 2 to 3 3 to 2

Page 648 Guided Practice #’s 4-8

Pages with someone at home and study examples! Read:

Homework: Pages #’s 9-20, 24, Lesson Check 12-8

12. not red or green

Page 755 Lesson 12-8

1,12,13,14,15,16,1 1,22,23,24,25,26,2 1,32,33,34,35,36,3 1,42,43,44,45,46,4 1,52,53,54,55,56,5 1,62,63,64,65,66,6 The possible outcomes of two number cubes!

The sums of the outcomes!

Even and Odd Sums

Multiples of

A sum of less than 2

A sum that is a prime

A sum that is composite

A sum not 8

A sum not 9 or 10

1,12,13,14,15,16,1 1,22,23,24,25,26,2 1,32,33,34,35,36,3 1,42,43,44,45,46,4 1,52,53,54,55,56,5 1,62,63,64,65,66,6 The possible outcomes of two number cubes!

The sums of the outcomes!