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Probability

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  • pg 1
									     Probability




By: JJ, Sinjon, and Austin
        Intro to Probability
• What is probability

Definitions
Probability- is a fraction of favorable
  outcomes over the total of possible
  outcomes

How to find probability
Basic Probability
Probability of independent events
Probability of compound events
             Examples
• There are 12 boys in the class, and 8
  girls in the class.
• Each student has there name in a
  hat.
• What is the probability of drawing a
  girl?
• First find the total of all the names
  12+8= 20
• Next find how many girls are in the
  class= 8
• So 8/20 is the answer or 4/5
              Practice
• Ekul is exploring the African
  wilderness. In the brush around him
  there is a harmless green snake, a
  dangerous rattlesnake, and 2
  extremely venomous king snakes.
  What is the probability that Ekul will
  be attacked by a one of the
  dangerous snakes.

              Answer: 3/4
              Practice
• Xander is a professional skydiver. He
  is grabbing his parachute when the
  pilot approaches him and says “One
  parachute is dysfunctional, another
  has a ripped parachute, and one has
  a faulty rip cord.” There is a total of
  5 parachutes. What is the probability
  that Xander will pick a working
  parachute?

             Answer: 2/5
                Practice
• Borscehkoff the Viking is deciding which
  village to pillage. He has been warned that
  2 of the coastal villages have have a highly
  trained citizen defense service. He has
  also learned that 3 other coastal villages
  have been diagnosed with an extremely
  dangerous epidemic. He must choose from
  a total of 9 villages. What is the
  probability that Borscehkoff will pick a
  safe town to plunder?

                Answer: 4/9
         Practice Game
Turn to Page 567 in a Real Math book

   Get one red die numbered 0-5
  Get one blue die numbered 5-10

Take 2,3,or 4 rolls to get closest to 15

          Play in groups of 2
             Lesson answers
•   1.) D.
•   2.) A.
•   3.) A.
•   4.) A.
•   5.) C.
•   6.) A.

								
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