Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failed keyboards, 6 of which haveelectrical defects and 19 of which have mechanical defects.(a) How many ways are there to randomly select 6 of these keyboards for a thorough inspection (without regard to order)?ways(b) In how many ways can a sample of 6 keyboards be selected so that exactly two have an electrical defect?ways(c) If a sample of 6 keyboards is randomly selected, what is the probability that at least 5 of these will have a mechanical defect? (Round your answer to fourdecimal places.)

Answered: Image /qna-images/answer/6c329ef1-a6b3-40d2-b577-ea1c4f3927b4.jpg

Answered: Computer keyboard failures can be…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Diana Baniak, searching for an Ecology class, knows that it must be in one of EIGHT classrooms. Since the professor does not allow people to enter after the class has begun, and there is very little time left, she decides to try just FOUR of the rooms at random. How many of the possible different selections of FOUR rooms will succeed in locating the class? There are _______ successful selections.
When making an ice cream sundae, you have a choice of 33 types of ice cream flavors: chocolate (C), vanilla (V), or Moose Tracks (M); a choice of 22 types of sauces: hot fudge (H) or butterscotch (B); and a choice of 22 types of toppings: whipped cream (W) or fruit (F). If you are choosing only one of each, list the sample space in regard to the sundaes (combinations of ice cream flavors, sauces, and toppings) you could pick from. Separate the elements of the sample space with commas.
(3) Times, Wall Street Journal, and USA Today: In a survey of 150 business travelers, it was found that of three daily newspaper, New York 71 read New York Times; 43 read Wall Street Journal; 34 read USA Today; 30 read New York Times and Wall Street Journal; 25 read New York Times and USA Today; 15 read Wall Street Journal and USA Today; 10 read all three. A person is selected at random from this 150 travelers. (a). What is the probability that the randomly selected person reads New York Times or USA Today but not Wall Street Journal? (b). Given that this traveler read at least one of these three newspapers, what is the probability that he/she read USA Today? (c). Given that this traveler read exactly one of these three newspapers, what is the probability that he/she read Wall Street Journal?
A friend of mine is giving a dinner party. His current wine supply includes 7 bottles of zinfandel, 11 of merlot, and 13 of cabernet (he only drinks red wine), all from different wineries. (a) If he wants to serve 3 bottles of zinfandel and serving order is important, how many ways are there to do this? (b) If 6 bottles of wine are to be randomly selected from the 31 for serving, how many ways are there to do this? (c) If 6 bottles are randomly selected, how many ways are there to obtain two bottles of each variety? (d) If 6 bottles are randomly selected, what is the probability that this results in two bottles of each variety being chosen? (Round your answer to three decimal places.) (e) If 6 bottles are randomly selected, what is the probability that all of them are the same variety? (Round your answer to three decimal places.)
In a survey of 233 people about the operating systems of various devices that they use (cell phone, tablet, laptop, etc.), the following results were obtained: 146 people use an Android device 150 people use an Apple device 79 people use Android and Apple devices 77 people use Android and Windows devices 67 people use an Apple device, but no Windows device 32 people use Android, Apple, and Windows devices 8 people use devices that are not Android, not Apple, and not Windows How many people use a Windows device?
(a) A bank analyst wants to ask customers who have a mortgage with the bank about the customers' home-buying experiences. Which of the following best describes a random sample of customers? The analyst forms groups of 9 customers based on the cities the customers live in. Then, she selects all of the customers in 6 randomly chosen groups. The analyst spends a day calling mortgage customers and selects the first 54 customers who answer because these customers are easily accessible. The analyst uses a computer program to draw 54 customers at random and selects these customers. Every set of 54 customers is equally likely to be drawn by the computer program. (b) A facilities supervisor at a sports stadium wants to rate the condition of the seats at the stadium. Which of the following best describes a stratified sample of seats? The supervisor uses a computer program to draw 60 seats at random and selects these seats. Every set of 60 seats is equally likely to be drawn by the computer…
a. A marine biologist measures the effectiveness of mating displays among tortoises in one of six environmental conditions. Ten tortoises are randomly assigned to each condition. (for this item, also give the degrees of freedom) b. A neuropsychologist measures the behavioral response to electrical stimulation in one of five brain regions. c. A sociologist records the number of children born in a local village each season (spring, summer, fall, winter) in a single year. d. A social psychologist has participants rate the likability of a person described as having one of three types of leadership styles. The breakdown of leadership styles is 25 autocratic, 25 bureaucratic, and 25 democratic. (for this item, also give the degrees of freedom) For items (a) – (d) identify the following: k? N? n? (assumed equal size groups)? What is the decision at 0.05 level of significance for each of the following tests? Are post hocs necessary? a. F(3, 28) = 3.00 b. F(1, 40) = 4.98 c. F(4, 30) = 2.72 d.…
In a survey, it was found that 80% of adults operate the flusher of toilets in public restrooms with their foot. (a) If 300 adults are randomly selected, how many would we expect to flush toilets in public restrooms with their foot? (b) Would it be unusual to observe 255 adults who flush toilets in public restrooms with their foot? (a) We would expect (Type a whole number.) adults to flush toilets in public restrooms with their foot. (b) Would it be unusual to observe 255 adults who flush toilets in public restrooms with their foot? Choose the correct answer below. O A. Yes, because 255 is greater than u + 2o. O B. No, because 255 is greater than u + 20. O C. Yes, because 255 is between u - 20 and u+ 20. O D. No, because 255 is less than u- 20. O E. No, because 255 is between u -20 and u+ 20.
A packet of gummy candy contains four strawberry gums, two lime gums, four black currant gums, and two orange gums. April May sticks her hand in and selects eight at random. Complete the following sentences. (a) The sample space is the set of all sets of gummy candies chosen from the packet of . (b) April is particularly fond of combinations of four strawberry and four black currant gums. The event that April will get the combination she desires is the set of all sets of gummy candies in which and .

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