Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Scenarios 1. Grayson and Jade are playing a game. Grayson is winning by two points. He can increase his score by 15% if he lands on a pink or green space. The spinner for the game is made of 6 equal sections, red, blue, purple, green, yellow, and pink. What is Grayson’s probability of spinning a pink or a green? 2. June is rolling a number cube. What is the probability of her rolling a number greater than 2 or an even number? 3. The probability of a Howard County student owning a bicycle is 0.85, of owning a scooter is 0.53, of owning both a scooter and bicycle is 0.47. If a Howard County student is chosen at random what is the probability he/she owns a scooter or a bicycle? 4. A survey was conducted to collect data on dental hygiene. The results are shown in the table below. Based on the sample, what is the probability that a person brushes at least twice a day or flosses their teeth? Brushes 0-1 times per day Brushes 2 or more times per day Total Flosses 10 Does not floss 10 Total 20 46 109 155 56 119 175 5. In Mr. Schaefer’s class of 28 students, 18 are boys and 10 are girls. On the last geometry test she gave 7 of the girls and 9 of the boys received an A. What is the probability that a student chosen at random scored an A and was a girl? What is the probability that a student chosen at random scored an A or was a boy? How does your solution strategy differ in order to find the solution to these two questions? 6. Create a scenario where the probability of Event A or Event B occurring is 0.75. Scenarios - Solutions 1. Grayson and Jade are playing a game. Grayson is winning by two points. He can increase his score by 15% if he lands on a pink or green space. The spinner for the game is made of 6 equal sections, red, blue, purple, green, yellow, and pink. What is Grayson’s probability of spinning a pink or a green? The probability of landing on any section is pink or green is or . The probability of landing on . 2. June is rolling a number cube. What is the probability of her rolling a number greater than 2 or an even number? Numbers greater than 2: 3, 4, 5, 6 Even numbers: 2, 4, 6 The probability of rolling a number greater than 2 or an even number is . 1 2 3 4 5 6 3. The probability of a Howard County student owning a bicycle is 0.85, of owning a scooter is 0.53, of owning both a scooter and bicycle is 0.47. If a Howard County students is chosen at random what is the probability he/she owns a scooter or a bicycle? The probability of a student owning a scooter or a bicycle is 0.85 + 0.53 – 0.47 = 0.93. 0.07 0.38 0.47 Bicycle 0.06 Scooter 4. A survey was conducted to collect data on dental hygiene. The results are shown in the table below. Based on the sample, what is the probability that a person brushes at least twice a day or flosses his/her teeth? Brushes 0-1 times per day Brushes 2 or more times per day Total Flosses 10 Does not floss 10 Total 20 46 109 155 56 119 175 The probability that a person brushes at least twice a day or flosses his/her teeth is . 5. In Mr. Schaefer’s class of 28 students, 18 are boys and 10 are girls. On the last geometry test she gave 7 of the girls and 9 of the boys received an A. What is the probability that a student chosen at random scored an A and was a girl? Boy Girl Total Received A 9 7 16 Did not receive A 9 3 12 Total 18 10 28 The probability that a student chosen at random scored an A and was a girl is What is the probability that a student chosen at random scored an A or was a boy? Boy Girl Total Received A 9 7 16 Did not receive A 9 3 12 Total 18 10 28 The probability that a student chosen at random scored an A or was a boy is . How does your solution strategy differ in order to find the solution to these two questions? Answers will vary. Students may identify that question 1 represents the overlap, whereas question 2 requires the addition rule. Students may or may not choose to create a two-way table to solve. 6. Create a scenario where the probability of Event A or Event B occurring is 0.75. Answers will vary.