43 On-Time Flights According to flightstats.com, AmericanAirlines flights from Dallas to Chicago are on time 80% of thetime. Suppose 100 flights are randomly selected.(a) Compute the mean and standard deviation of the randomvariable X, the number of on-time flights in 100 trials of theprobability experiment.(b) Interpret the mean.(c) Would it be unusual to observe 75 on-time flights in a randomsample of 100 flights from Dallas to Chicago? Why?44. Morality In a recent poll, the Gallup Organization foundthat 45% of adult Americans believe that the overall state ofmoral values in the United States is poor.(a) Compute the mean and standard deviation of the randomvariable X, the number of adults who believe that the overallstate of moral values in the United States is poor based on arandom sample of 500 adult Americans.(b) Interpret the mean.(c) Would it be unusual to identify 240 adult Americans whobelieve that the overall state of moral values in the UnitedStates is poor based on a random sample of 500 adultAmericans? Why?

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Answered: 43 On-Time Flights According to…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A racing car consumes a mean of 103 gallons of gas per race with a variance of 36. If 38 racing cars are randomly selected, what is the probability that the sample mean would be greater than 101.5 gallons? Round your answer to four decimal places.
A shipment of 7 television sets contains 2 defective sets. A hotel makes a random purchase of 3 of the sets. requried: frequency distribution table of random variable expected value of non defective sets
Suppose you are playing a game and you get to roll 40 six-sided dice on your next turn. If you get a total of 160 or more from the 40 dice, you will win the game. Using sampling distributions, what is the probability that you will get a total of 160 or more with the 40 dice? Some useful things to know: When one six-sided die is rolled, the die roll (or number of spots showing) has a mean of 3.5 and a standard deviation of approximately 1.71.
According to CTIA, 41% of all U.S. households are wireless-only households (no landline). Choose four households at random. A. What is the probability that at least two will be wireless-only? B. What is the probability that none of them will be wireless-only? C. What is the probability that least 1 of them will be wireless-only? D. Find the mean and standard deviation for the number of households that are wireless-only.
Fifty random shoppers at an electronics store have been interviewed and 35 of them intend to purchase a newly released smart phone. What probability distribution describes this situation and what are its mean and standard deviation of phone sales if we are concerned about 1071 shoppers that day? Compute to the nearest whole number.
Q3 A box contains 6 balls. Two are numbered 4, two are numbered 5, and two are numbered 6. The balls are mixed and one is selected at random. After a ball is selected, its number is recorded. Then it is replaced. If the experiment is repeated many times, find the variance (02) and standard deviation (o) of the numbers on the balls.
According to an almanac, 70% of adult smokers started smoking before turning 18 years old. (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 300 trials of the probability experiment. (b) Interpret the mean. (c) Would it be unusual to observe 240 smokers who started smoking before turning 18 years old in a random sample of 300 adult smokers? Why? ..... (a) Hx = Oy = (Round to the nearest tenth as needed.) (b) What is the correct interpretation of the mean? O A. It is expected that in 50% of random samples of 300 adult smokers, 210 will have started smoking before turning 18. B. It is expected that in a random sample of 300 adult smokers, 210 will have started smoking after turning 18. C. It is expected that in a random sample of 300 adult smokers, 210 will have started smoking before turning 18. (c) Would it be unusual to observe 240 smokers who started smoking before turning 18 years old in a random sample of 300 adult…
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Calculate the probability of a sample mean being at least as high as a specified value when σ is estimated?
Of all the students, 44% own an iPhone, with a standard deviation of .03 For that same sample of 400 students, what is the probability that at least 42% of them own an iPhone?

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