9. It is estimated that 4000 of the 10,000 voting residents of a town are against a new sales tax. If 15eligible voters are selected at random and asked them opinion, what is the probability that at most 7favor the new tax?

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Answered: 9. It is estimated that 4000 of the…

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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5. A tire company produced a batch of 6300 tires that includes exactly 250 that are defective. If 4 tires are randomly selected for installation, what is the probability that they are all good? (Do the calculations “without replacement”)
5. A bag contains 20 purple marbles, 15 red marbles, and 5 blue marbles. What is the probability of randomly selecting a purple marble, not putting it back, and then randomly selecting a blue marble? (Express your answer as a decimal rounded to two places.)
19. In a certain college, 33% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, what is the probability that exactly 2 belong to an ethnic minority? 20. Use the information in the previous question to find the probability that at most 2 students belong to a minority.
12. Find the probability that at most 5 defective fuses will be found in a box of 200 fuses if experience shows that 2 per cent of such fuses are defective.
1. A city has 9 coffee shops: 3 Starbuck's, 2 Caribou Coffees, and 4 Crazy Mocho Coffees. If a person selects one shop at random to buy a cup of coffee, find the probability that it is either a Starbuck's or Crazy Mocho Coffees.
3. Among the products of the first company, defective is 10%, the second - 20%, the third - 25%. We bought 6 products from the first company, 8 from the second and 4 from the third. For verification, one product was tested. Find the probability that it is valid.
10) According to the American Academy of Ophthalmology, there is a 45% chance that someone will have brown eyes. What is the probability that all of the next seven people selected will have brown eyes?
16. Ten percent of the students at a certain college are non-resident. A reporter for the student paper would like to interview at least 5 non-residents. If the reporter randomly selects 100 names from the student directory and begins contacting them, what is the probability that she will contact at least 5 non-resident students?

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9. It is estimated that 4000 of the 10,000 voting residents of a town are against a new sales tax. If 15 eligible voters are selected at random and asked them opinion, what is the probability that at most 7 favor the new tax?