You plan to organize a party for the freshmen in the university and would like to have a goodestimate of the number of students that will come. For this purpose you conduct a survey ofrandom freshmen asking them whether they plan to come or not. If there are 1000 freshmen,at least how many students do you need to ask to be able to claim that your guess for thenumber of students that will come will be within 50 of the actual number with probabilityat least 80%?

The given information is as follows: Denote the population proportion of students that will come to…

Answered: You plan to organize a party for 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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The probability Kayla will score above 80% on a mathematics test is 0.60. Kayla will take five tests this semester. We want to find the probability she will score above 80% on exactly four out of the five tests. What is the probability of Kayla scoring above 80% on exactly four out of the five tests?
A common lab test during a medical exam is a blood count. The two main aspects are counting the number of white blood cells and differentiating white blood cells into several categories. One of the categories is neutrophils. Suppose 60% of white blood cells are neutrophils in a healthy person. What is the probability of seeing 2 neutrophils in a sample of three white blood cells from a healthy person? What is the probability of seeing 2 or fewer?
Another bag of marbles contains 6 blue marbles and 1 green marble. Mary and Frank will draw a blue marble followed by a green marble, without replacing the first marble. Mary says the probability will be 4/49, Frank says that the probability will be 1/7. Who is correct? Explain and justify your answer by showing work.
Delaney is about to take a final exam that consists of 20 questions. To motivate her to study, her parents promised her $500 if she gets at least 17 questions right. The questions are multiple choice and the probability of her getting a question right is 0.75 on each question of the final exam. What is the probability that she gets exactly 17 questions right? What is the probability that she gets at least 17 questions right?
the rest were line drives. If Jason's mom only got to see one game during the tournament, what was the Jason got 16 hits in his baseball tournament. Two of his hits were home runs, ten were ground balls, and probability that she saw Jason hit a line drive? Write the probability as a percent. 6. Elizabeth had a spinner that was divided into 8 equal sections and numbered 1-8. If she spins the spinner 56 times, how many times should Elizabeth expect the spinner to stop on the number 4?
An anthropologist wants to determine the probability that exactly 15 out of 25 ancient civilizations collapsed because of poor leadership. If the probability of the civilizations collapsing because of poor leadership is 72%, the number of trials is and the number of successful trials is The probability that exactly 15 out of 25 civilizations collapsed because of poor leadership is
Last semester in a business fraternity, 30% of the members were on the Dean's List and 15% of the members were on academic probation. If being on the Dean's List and being on academic probation are mutually exclusive events, find the percent of members who were neither on the Dean's List nor on academic probation.
At The Fencing Center, 60% of the fencers use the foil as their main weapon. We randomly survey 28 fencers at The Fencing Center. We are interested in the numbers that do not use the foil as their main weapon. Find the probability that eleven do not use the foil as their main weapon.
Please show your solution. A petroleum company exploring for oil has decided to drill 2 wells, one after the other. The probability of not striking oil in the first well is 0.25. Given that they strike oil in the first attempt, the probability of striking oil in the second attempt is 0. 85. What is the probabilty of striking oil in both wells?

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