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11.2 Probability Day 1

11.2 Probability Day 1. 5/3/16 Tuesday. Warm – up #2 5/3/16. Work on Extra W-S Counting Principle . (one sided) I will stamp Friday 4/29, when finished. Today: Notes Pg. 5-7. Yesterday: Notes Pg. 3-4. Homework Log. 5/3/16 Lesson 11-2 Probability Day 1. Pg. 5-7 Notes packet.

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11.2 Probability Day 1

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  1. 11.2 Probability Day 1 5/3/16 Tuesday

  2. Warm – up #2 5/3/16 Work on ExtraW-S Counting Principle. (one sided) I will stamp Friday 4/29, when finished. Today: Notes Pg. 5-7 Yesterday: Notes Pg. 3-4

  3. Homework Log

  4. 5/3/16 Lesson 11-2 Probability Day 1 Pg. 5-7 Notes packet Algebra II

  5. Pg. 5 Notes packet Probability P(Event) = P(E) Toss of coin: Probability of landing on heads: P(H) = “Probability of an event”

  6. Pg. 5 Notes packet Probability P(will definitely occur) = 1 ex: Have 1 die. P(roll a #) = 1 P(never occur) = 0 ex: Have 1 die. P(roll a letter) = 0

  7. Pg. 5 Notes packet Ex: EX: A die is rolled. Find the probability the number showing is even. Even: 2, 4 , 6  # of favorable outcomes = 3 # of total outcomes = 6 P(Even) = EX: A die is rolled. Find the probability the number showing is a 5 or a 6. # of favorable outcomes P(5 or 6) = = 2

  8. Pg. 6 Notes packet Probability EX: A spinner is divided into tenths. The sections are numbered 1 to 10. If the spinner is spun, find the probability the number is • a multiple of 4 4 or 8 P(4 or 8) = • between 0 and 30 1, 2, 3, 4, 5, …10 P(1, 2, … , 10) = 1 10 2 9 3 8 4 7 5 6

  9. Pg. 6 Notes packet Probability A spinner is divided into tenths. The sections are numbered 1 to 10. If the spinner is spun, find the probability the number is • 2 P(2) = • ½ ½ isn’t on the spinner P(½) = 1 10 2 9 3 8 4 7 5 6

  10. Pg. 6 Notes packet Probability EX: A bag contains 8 brown socks and 6 black socks. If two socks are randomly drawn, what is the probability that they will match? Total socks = 14 Two cases: 1. Two Brown: 2. Two Black: only 7 brown & 13 total left now OR only 5 black & 13 total left now

  11. Pg. 6 Notes packet Probability EX: A die is rolled. Find the probability of each event. • The number showing is less than 5 1, 2, 3, or 4 • The number showing is between 2 and 6. 3, 4, 5

  12. Pg. 6 Notes packet Probability EX: Two dice are rolled and the numbers are noted. Find the probability of each event. • The sum of the numbers is less than 5

  13. Pg. 7 Copy it down! Part a) Sum < 5 ? Possibilities when 2 dice are rolled TOTAL = 36

  14. Pg. 6 Notes packet Probability Two dice are rolled and the numbers are noted. Find the probability of each event. • The sum of the numbers is less than 5 • The sum of the numbers is 4 or 5.

  15. Part b) Sum = 4 or 5 ? Possibilities when 2 dice are rolled

  16. Back to Pg. 6 Notes packet Probability Two dice are rolled and the numbers are noted. Find the probability of each event. • The sum of the numbers is 4 or 5. P(4 or 5) =

  17. Probability EX: There are 12 tulip bulbs in a package. Nine will yield yellow tulips and three will yield red tulips. If two bulbs are selected at random, find the probability of each event. • Both tulips will be red • One tulip will be yellow and the other red CaseI: Y/R Case 2: R/Y 12 total 9 Yellow 3 Red only 2 red & 11 total left now

  18. Homework 15-9 Probability WS

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