ID: A7. A random sample of 80 cmployees at a large grocery store with multiplc locations was asked if theyspend more than 30 minutes commuting to work. Assume the truc proportion of employees that spendmore than 30 minutes commuting to work 35%. Which of the following is closcst to the probability thatmore than 30 employces in a samplc of 80 cmployees would respond that they spend more than 30minutes commuting to work cach day?0.3196b.a.0.45620.5438d.C.0.6804

Answered: Image /qna-images/answer/3a1496fc-de43-45f2-9902-577bda6e1370.jpg

Answered: 7. A random sample of 80 employees at a…

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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Rachel, the head chef in a restaurant, modelled the amount of waiting time for dishes to getserved to the customers. According to her, the waiting time is normally distributed with meanequal to 10 minutes, and standard deviation equal to 2 minutes. a. What is the probability that the waiting time for a dish is from 8.5 to 11.5 minutes?b. What is the probability that the waiting time for a dish is greater than 10 minutes?c. What is the probability that the waiting time for a dish is less than 8 minutes?
Assume that the heights of 6000 male students at a university are normally distributed with mean 64.0 inches and standard deviation 2.7 inches. If a random sample of 81 students are selected with replacement, What is the probability that the average height in the sample will be between 63.34 and 64.45 inches? O A. 0.849 O B. 0.9193 O C. 0.6803 O D. 0.7767
16s
A rare form of malignant tumor occurs in 11 children in a million, so its probability is 0.000011. Four cases of this tumor occurred in a certain town, which had 14,318 children. Assuming that this tumor occurs as usual, find the mean number of cases in groups of 14,318 children. Using the unrounded mean from part (a), find the probability that the number of tumor cases in a group of 14,318 children is 0 or 1. What is the probability of more than one case? Does the cluster of four cases appear to be attributable to random chance? Why or why not? (*Need before midnight pleeeease!)
Suppose the heights of 18 year old men are approximately normally diatributed, with mean 67 inches and standard deviation 5 inches. What is the probability that an 18 year old man selected at random is between 66 and 68 inches tall
10. Bags of grain in a warehouse have a mean weight of 60 pounds with a standard deviation of 4 pounds. a. In random samples of 36 bags, what is the probability the total weight of the bags is less than 2100 lb? b. In random samples of 36 bags, what is the 80th percentile for the total weight of the 36 bags?
O An electrical firm manufactures light bulbs that have a length of life that is normally distributted with mean equal to (800) hours and a standard deviation of (40) hours. Find the probabilitythat a bullb burns between 778 and. 834 hours?
The service time for customers coming through a checkout counter has mean 51.4 seconds and standard deviation 6.8 seconds. Find the probability that the average service time for 64 passengers to get service will fall between 49.9 and 52.9 seconds. O 0.9216 O 0.9608 O 0.1741 O 0.0392
The mean number of patients admitted per day to the emergency room of a small hospital is 1.5. If, on any given day, there are only 7 beds available for new patients, what is the probability that the hospital will not have enough beds to accommodate its newly admitted patients?
2.Suppose that 60% of middle school students in San Diego wear braces. A random sample of 250 San Diego middle school students is selected. a.What is the mean and standard deviation of the 250 samples students that will have braces? b.What is the probability that at most 190 students in the sample wear braces?
7.3. -> 5% of students wear glasses. What is the probability that in the group of 200 students at least 15 of them wear glasses? [Answer -> 0,053]
A research team is working on a project to study the time (in seconds) for high school male runners to finisha 400-meter race. Jimmy, a junior researcher in the team, has randomly selected a sample of 25 male runnersfrom a high school and the time (in seconds) for each of them to complete a 400-meter race was recorded.The sample mean running time was 53 seconds. It is assumed that the running time in a 400-meter racefollows a normal distribution with a population standard deviation of 5.5 seconds.(a) Give a point estimate of the population mean running time for a 400-meter race.(b) Calculate the sampling error at 95% confidence level.(c) Construct a 95% confidence interval estimate of the population mean running time for a 400-meter race. (d) If instead of 25, 80 male runners are selected for the study, what is the sampling error at 95% confidencelevel? When the 95% confidence interval is constructed based on a sample with 80 male runners, wouldyou expect the interval will be (I)…

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