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Information about Probability

Published on July 16, 2009

Author: mrferrell


Probability? : Probability? What is the probability of a penny landing heads up when it is tossed? Slide 2: Example_1__Probability_Expressed_as_Fractions__Coins_and_Spinners Objective : Objective Represent the probability of a simple event in an experiment or simulation using fractions and decimals. What is probability? : What is probability? The probability of an event happening in a random experiment is the ratio (fraction) of the number of successful outcomes as the numerator over the total number of outcomes as the denominator. Probability : Probability Fractions and Decimals : Fractions and Decimals Convert fraction to a decimal by dividing numerator by denominator to get a decimal. An example would be the probability of rolling an even number on a die would be 3/6 which can be simplified to ½ or 0.5 as a decimal. Slide 7: What is the probability that a green candy will be pulled out on the first try? Blue candy? Red candy? Ziploc Probability : Ziploc Probability Fill a bag with an assortment of construction paper pieces. Using a sticky note document the contents of the bag. Ziploc Probability : Ziploc Probability Calculate the probability of pulling out each different color on the first try. Does it change the probability when you are pulling for the second time? Can you adjust all the probabilities? Example Questions : Example Questions Slide 11: Veronica rolls a 6-sided number cube that has sides numbered 1 through 6. What is the probability of the number cube landing with a number greater than 4 facing up? 0.5 0.25 1/6 1/3 Slide 12: A teacher surveys a class of 20 students about their after-school activities. There are 12 students who play sports. The teacher puts the names of all the students in the class in a hat and randomly selects a name. What does the number 8/20 represent? the fraction of students who completed the survey the fraction of students who did not complete the survey the probability that the student whose name was selected plays sports the probability that the student whose name was selected does not play sports Slide 13: There are 9 marbles in a jar. 4 of the marbles are purple and the rest of the marbles are black. Maddie randomly selects 1 marble from the jar. What is the probability that she selects a black marble from the jar? 1/9 5/9 4/9 0.11 Slide 14: Each side on a 6-sided cube is labeled with the letters X, W, W, Z, Z, and Q. Anthony is going to roll the cube once. When he rolls the cube, what is the probability that a letter Z will land face up? 1/26 1/2 1/3 1/6 Slide 15: Players spin a spinner, shown below, to move their game piece during a board game. What does the probability of 0.25 represent in this situation? the probability of the spinner stopping on a space labeled 1 the probability of the spinner stopping on a space labeled 2 the probability of the spinner stopping on a space labeled 3 the probability of the spinner stopping on a space labeled 4 Practice Activity : Practice Activity Slide 17: Jon tossed a coin ninety-nine times. Each time he tossed it, the coin landed heads up. Jon tosses the coin a hundredth time. What is the probability that the coin will land heads up on the hundredth time? 0.01 0.05 0.99 0.50 Slide 18: There are 20 students and 22 desks in a classroom. The teacher randomly assigns each of the 20 students to a desk. What is the probability that a desk in the classroom does not have a student assigned to it? 1/11 11/22 11/20 10/11 Slide 19: A spinner has 4 equal-sized sections. Each section is one of four colors: red, blue, green, and yellow. What is the probability that the arrow on the spinner will stop in the green section? 0.25 0.05 0.14 0.4 Slide 20: Angel has a deck of cards used for a game. In the deck, 3 cards have blue circles, 4 cards have red circles, and 5 cards have blue squares. Angel incorrectly said that if she selects a card from the deck without looking, the probability that she will select a card with a blue shape is 1/3. Which mistake could Angel have made? She computed the probability of selecting a card with a red shape. She computed the probability of selecting a card with a circle. She computed the probability of selecting a card with blue shapes. She computed the probability of selecting a card with blue squares. Closing Question : Closing Question There is a bag with 9 tiles. The tiles have the following letters, one letter on each tile: A, B, C, E, G, H, I, L, and O. If one tile is selected at random, what is the probability that it will be? Enrichment Question : Enrichment Question Create a multiply choice question that shows someone incorrectly answering a probability problem. In your answer choices give your audience a chance to find the error that was made. Enrichment Mini-Project : Enrichment Mini-Project Create a game to play with a spinner and/or cards. Compare and contrast possible outcomes to the game. Include possible outcomes and record actual outcomes for each game.

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