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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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