A normal population has mean i=7 and standard devlation a= 8.(a) What proportion of the population is less than 20?(b) What is the probability that a randomly chosen value will be greater than 4?Round the answers to four decimal places.Part 1 of 2The proportion of the population less than 20 isPart 2 of 2The probability that a randomly chosen value will be greater than 4 is

Answered: Image /qna-images/answer/7919d493-9856-40d9-bd00-993c7ada499c.jpg

Answered: A normal population has mean l=7 and…

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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Find the probability that more than 68% of the sampled adults drink coffee daily.
Homework #6
TEN Suppose that the time required to complete a 1040R tax form is normal distributed with a mean of 110 minutes and astandard deviation of 15 minutes. What proportion of 1040R tax forms will be completed in less than 106 minutes? Round your answer to at least four decimal places.
Part 1 A population of values has a normal distribution with mean of 50.6 and standard deviation of 98.9. a) Get the z-score for a value of 44. For this problem you use the z score formula b) This z-score tells you how many the score of 44 is above or below the population mean u. c) Find the probability that a randomly selected value is less than 44.
A6-18. A research worker wishes to estimate the mean of a population by using sufficiently large sample. The probability is 0-95 that the sample mean will not differ from the true mean by more than 25% of the standard deviation. How large a sample should be taken ? rune
ES209 PROBLEM SOLVING Let X̅ be the mean of a 50-person random sample taken from a population with a mean of112 and a standard deviation of 40.a. Calculate the mean and standard deviation of X̅. b. Calculate the likelihood that X̅ will take on a value between 110 and 114. c. Calculate the likelihood that X̅ will have a value larger than 113.
Please no written by hand solution and no img In a certain town a survey organization took a simple random sample of 225 homes to find the average price of a home. The sample average turned out to be $390,000. It was known that before the average price was $395,000 with an SD of $60,000. The organization was concerned that the average price has change with time. Can you say if the difference is a real change or just a chance variation?
I’m not understanding what I’m doing wrong please help
STATISTICAL ANALYSIS (No long explanation needed. Rate will be given and write the complete solutions.) Choose the correct answer. CI on the Mean, Variance Known a. The probabilities increase as n increase. As n increases, the sample variances should approach the population variance. Therefore, the likelihood of obtaining a sample variance greater or smaller than the population variance increases. b. The probabilities decrease as n increase. As n increase, the sample variances should approach the population variance. Therefore, the likelihood of obtaining a sample variance greater or smaller than the population variance decreases c. The probabilities decrease as n increase. As n increases, the sample variances should deviate the population variance. Therefore, the likelihood of obtaining a sample variance greater or smaller than the population variance decreases d. The probabilities increase as n increase. As n increases, the sample variances should approach the population variance.…
What is the value of the mean? 1 2 3 Р(X-х) 0.15 | 0.20 0.15 0.50
Quiz Module 1 In a psychology class, 50 students have a mean score of 93 on a test. Then 27 more students take the test and their mean score is 67.9.What is the mean score of all of these students together? Round to one decimal place.mean of the scores of all the students =
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