Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failedkeyboards, 13 of which have electrical defects and 12 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 mechanicaldefect? (Round your answer to four decimal places.)

Selection, election, collection - all these are referred by combination. The probability of an event…

Answered: Computer keyboard failures can be…

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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Question 10 It's hot out there! You made a batch of 24 frozen ice pops and would like to select a group of 3 to test for quality control. How many possible groups of 3 could you select? Group of answer choices 2,090 2,024 506 12,144 Question 11 You are at Walmart buying pool noodles for the summer. You are selecting 5 pool noodles from a bin that contains 9 green noodles, 16 red noodles, 20 blue noodles, and 17 yellow noodles. What is the probability that you select 2 yellow, 1 blue, and 2 red pool noodles? Round your answer to 5 decimal places. Group of answer choices 0.00191 0.00034 0.00168 0.00219 Question 12 The following data represents the popularity of meat pizza toppings during lunch and dinner: What is the probability that a randomly selected customer orders pepperoni? Round your answer to 4 decimal places. Group of answer choices 0.7077 0.6692 0.4643 0.2759 Question 13 The following data represents the popularity of meat pizza toppings…
A researcher is comparing the effectiveness of three devices designed to help people who snore. There are 210 people who snore participating in the experiment. Using a table of random digits starting from the first row and column, the researcher will randomly place the participants into three equally sized treatment groups suitable for comparison. Which number range would be needed to label the subjects correctly? O 0-2 O 1-3 O 000-210 O 001-210
(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.)
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2Not long after being put into service, some electric scooters manufactured with a certain brandhave developed cracks on the underside of their main frame. Suppose a particular collegecampus has 25 such scooters, and cracks have actually appeared in eight of them.a. How many ways are there to select a sample of five scooters from the 25 for thoroughinspection?b. In how many ways can a sample of five scooters contain exactly four with visible cracks?c. If a sample of five scooters was chosen at random, what is the probability that exactlyfour of the five will have visible cracks?d. If scooters are selected as in part c, what is the probability that at least four of thoseselected will have visible cracks?
Magazine Ads. Advertising researchers F. Shuptrine and D. McVicker wanted to determine whether there were significant differences in the readability of magazine advertisements. Thirty magazines were classified based on their educational level—high, mid, or low—and then three magazines were randomly selected from each level. From each magazine, six advertisements were randomly chosen and examined for readability. In this particular case, readability was characterized by the numbers of words, sentences, and words of three syllables or more in each ad. The researchers published their findings in the paper “Readability Levels of Magazine Ads” (Journal of Advertising Research, Vol. 21, No. 5, pp. 45–51). The number of words of three syllables or more in each ad are provided on the WeissStats site. a. Obtain individual normal probability plots and the standard deviations of the samples. b. Perform a residual analysis. c. Use your results from parts (a) and (b) to decide whether conducting a…
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.
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