A marketing research company has been engaged by a mobile app development company toconduct a survey on the mobile Operation System (OS) preference of Male and Female mobileusers. A survey was conducted on 500 randomly selected mobile users and following is theresult:Mobile OSRobotGenderMaleFemaleiOXWins13480456312850Assume the survey result is a good representation of the population.A user is randomly selected from the population. Calculate, leaving your answers as fractions:a) The probability that a randomly selected mobile user is a female and prefers iOX.b) The probability that a randomly selected mobile user who prefers either iOX or Wins is afemale.c) The probability that a male mobile user prefers either Robot or Wins.

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Answered: A marketing research company has been…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Pollsters are concerned about declining levels of cooperation among persons contacted in surveys.A pollster contacts 94 people in the 18-21 age bracket and finds that 80 of them respond and 14 refuse to respond.When 285 people in the 22-29 age bracket are contacted,265 respond and 20 refuse to respond.Assume that 1 of the 379 people is randomly selected .Find the probability of getting someone in the 22-29 age bracket or someone who does not respond.Report the answer as a percent rounded to one decimal place accuracy. P(22-29 or does not respond)=
Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 95 people in the 18-21 age bracket and finds that 81 of them respond and 14 refuse to respond. When 260 people in the 22-29 age bracket are contacted, 235 respond and 25 refuse to respond. Assume that 1 of the 355 people is randomly selected. Find the probability of getting someone in the 22-29 age bracket or someone who responds.Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol.P(22-29 or responds) =
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Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 75 people in the 18-21 age bracket and finds that 64 of them respond and 11 refuse to respond. When 290 people in the 22-29 age bracket are contacted, 274 respond and 16 refuse to respond. Assume that 1 of the 365 people is randomly selected. Find the probability of getting someone in the 22-29 age bracket or someone who refused to respond.Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol.P(22-29 or refused) = %(Hint: It might be helpful to organize the data into a table first.)
Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 88 people in the 18-21 age bracket and finds that 75 of them respond and 13 refuse to respond. When 292 people in the 22-29 age bracket are contacted, 270 respond and 22 refuse to respond. Assume that 1 of the 380 people is randomly selected. Find the probability of getting someone in the 18-21 age bracket or someone who agreed to respond. Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "" symbol. P(18-21 or agreed) = (Hint: It might be helpful to organize the data into a table first.)
Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 94 people in the 18-21 age bracket and finds that 80 of them respond and 14 refuse to respond. When 265 people in the 22-29 age bracket are contacted, 241 respond and 24 refuse to respond. Assume that 1 of the 359 people is randomly splected. Find the probability of getting someone in the 22-29 age bracket or someone who refused to respornd. Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol. P(22-29 or refused) % %3D (Hint: It might be helpful to organize the data into a table first.) Question Help: Written Example Message instructor Submit Question Jump to Answer
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According to a study, 81% of K-12 schools or districts in a country use digital content such as ebooks, audio books, and digital textbooks. Of these 81%, 6 out of 10 use digital content as part of their curriculum. Find the probability that a randomly selected school or district uses digital content and uses it as part of their curriculum. The probability that a randomly selected school or district uses digital content and uses it as part of their curriculum is (Round to three decimal places as needed.)
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Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 93 people in the 18-21 age bracket and finds that 79 of them respond and 14 refuse to respond. When 266 people in the 22-29 age bracket are contacted, 237 respond and 29 refuse to respond. Assume that 1 of the 359 people is randomly selected. Find the probability of getting someone in the 22-29 age bracket or someone who agreed to respond. Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol. P(22-29 or agreed) = (Hint: It might be helpful to organize the data into a table first.) Submit Question
A random sample of 1000 adults has the elements of the sample classified by sex (= Male or Female) and educations ( = College, high School or Elementary). The results are summarized in the contingency table below. College High School Elementary Male 130 270 140 Female 170 180 110 Find the probability that a randomly selected person who is selected from the survey members is male, given that the individual finished college.

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