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10204 '7

10:04 Back Ch 6 Probability-l.pdf Ch 6 Probability (1, 2, 3, 14, 16, 18 and 20) I. 2. 3. 4. 5. 6. 7. Dashboard A local hardware store has a "Saving Wheel" at the checkout. Customers get to spin wheel and, when the wheel stops, a pointer indicated how much they will save. The wheel can stop in any one of 50 sections. Of the sections, 10 produces 0% off, 20 sections are for 10% off, 10 sections for 20% off, 5 for 30%, 3 for 40%, 1 for 50%, and 1 for 100% off. Assuming that all 50 sections are equally like. a. What is the probability that a customer's purchase will be free (100% off)? b. What is the probability that a customer will get on savings from the wheel (0% off)? c. What is the probability that a customer will get at least 20% off? A psychology class consists of 14 males and 36 females. If the professor selects named from the class list using random sampling? a. What is the probability that the first student selected will be a female? b. If a random sample of n= 3 students is selected and the first two are both females, what is the probability that the third student selected will be a male? What are the two requirements that must be satisfied for a random sample? IQ test scores are standardized to produce a normal distribution with a mean of g = 100 and the standard deviation of 0=15. Find the proportion of the population in each of the following IQ categories. a. Genius or near genius: IQ greater than 140 b. Very superior intelligence: IQ between 120 and 140 c. Average or normal intelligence: IQ between 90 and 109 According to a recent report, people smile an average of g = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of 18, find each of the following values. a. What proportion of people smile more than 80 times a day? b. What proportion of people smile at least 50 times a day? Information from the Department of Motor Vehicles indicates that the average age of licensed drivers is g = 45.7. years with the standard deviation of oz. 12.5 years. Assuming that the distribution of drivers ages is approximately normal. a. What proportion of licensed drivers are older than 50 years old? b. What proportion of licensed drivers are younger than 30 years old? A report in 2010 indicated that American between the ages of 8 and 18 spend an average of g = 7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets. Assume that the distribution of times is normal with a standard deviation of 2.5 hours and find the following values. a. b. What is the probability of selecting ab individual who used electronic devices more than 12 hours a day? What proportion of 8- to 18 years old American spend between 5 and 10 hours per day using electronic devices? In symbols , p(5 < X < ? Calendar To Do Notifications Inbox