A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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- Samuel F.B. Morse (1791 – 1872), the creator of Morse Code, claimed that 12% of all letters used in the English language were “e”s. Suppose random samples of 196 letters are selected from a book. What is the probability that a random sample of 196 letters will contain less than 15% "e"s. Type your calculated z-score here. Express its value to the nearest hundredth (two decimal places). What is the probability that a random sample of 196 letters will contain at least 10% "e"s? Type your calculated z-score. Express its value to the nearest hundredth (two decimal places). Type your probability. Express its value to four decimal places. According to a May 2020 Counterpoint Research report, 72% of all new mobile devices in North America were iOS devices. Suppose random samples of size 400 are selected. What are the mean and the standard deviation of the sampling distribution for the proportion of iOS devices in these samples? Standard devation should be expressed to the…arrow_forwardA normal population has a mean μ=47 and standard deviation σ=3 . Round answers up to four decimal places. a) The proportion of the population that is between 44 and 50 is ["", "", "", ""] . b) The probability that a randomly chosen value is greater than 55 is ["", "", "", ""]arrow_forwardQUESTION 1 A retailer of Christmas trees has estimated the number of trees that he will sell during the next season. The folowing table summarizes the demands for trees and their respective probabilities: Probability (X) Demand 4 0,5 5 0.2 10 0,3 1.1. Is demand for trees a proper probability function? Why, or why not? 1.2. What is the probability that the demand for trees will be equal to 4? 1.3. What is the probability that the demand for trees will be equal to 10? 1.4. What is the probability that the demand for trees will be greater than 4? 1.5. What is the expected value of demand for trees? 1.6. What is the variance of the demand for trees?arrow_forward
- Let X = {Email, In Person, Instant Message, Text Message}; P(Email) = 0.06 P(In Person) = 0.55 P(Instant Message) = 0.24 P(Text Message) = 0.15 Is this model a probability distribution? A. Yes. B. No. C. Maybe.arrow_forward1. Suppose you are a technician, whose repair time on a given job is said to follow an exponential distribution with expected time θ = 3 hours. You have 5 independent jobs lined up (you complete them sequentially, one by one). a. What is the probability of taking exactly 2 hours to finish a given job? b. What is the probability it will take more than 2 hours on a given job? c. You are on a given job and you already have been working for 1 hour. What is the probability it will at least an additional 2 hours to complete this job?arrow_forwardSuppose you choose a random sample of size 100 from a large population of household incomes, which might or might not be normally distributed. If the population mean and population standard deviation are, respectively, $50,000 and $15,000, which of the following is at least approximately true because of the central limit theorem? a. The probability that the sample mean will be between $48,500 and $51,500 is above 0.99. b. The probability that the sample mean will be between $48,500 and $51,500 is about 0.95. c. The probability that the sample mean will be between $47,000 and $53,000 is about 0.95. d. The probability that the sample mean will be between $47,000 and $53,000 is about 0.68.arrow_forward
- Samuel F.B. Morse (1791 – 1872), the creator of Morse Code, claimed that 12% of all letters used in the English language were “e”s. Suppose random samples of 196 letters are selected from a book What is the probability that a random sample of 196 letters will contain at least 10% "e"s? Type your calculated z-score here. Express its value to the nearest hundredth (two decimal places). Type your probability here. Express its value to four decimal places. Do not round.arrow_forwardQUESTIÓN 6 Assume that a researcher randomly selects 14 newborn babies and counts the number of girls selected, x. The probabilities corresponding to the 14 possible values of x are summarized in the given table. Answer the question using the table. Probabilities of Girls x(girls) P(x) x(girls)| P(x) x(girls) P(x) 0.061 0.000 0.122 10 1 0.001 6 0.183 11 0.022 2 0.006 7 0.209 12 0.006 3 0.022 0.183 13 0.001 4 0.061 9 0.122 14 0.000 Find the probability of selecting exactly 5 girls. O 0.022 O 0.122 O 0.061 O 0.001arrow_forwardUse the following information to answer A-C. The table below shows the probablity of a certain number of students having fatigue. (Out of 4 randomly selected students)/ x P(x) 0 0.10 1 0.20 2 0.35 3 0.30 4 0.05 A) What is the probability that more than 2 of 4 randomly selected students have fatigue? B) What is the mean (to the nearest 0.1) number of students with fatigue out of 4 randomly selected students? C) What is the standard deviation (to the nearest 0.1) of the number of students with fatigue out of 4 randomly selected students? [Show all work with a table or formula]arrow_forward
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