10 The distribution of the weights of those rowing in a very large regatta may be taken to be normal with mean 80 kg and standard deviation 8 kg. (i) What total weight would you expect 70% of randomly chosen crews of four rowers to exceed? (ii) State what assumption you have made in answering this question and comment on whether you consider it reasonable.

10 The distribution of the weights of those rowing in a very large regatta may be taken to be normal with mean 80 kg and standard deviation 8 kg. (i) What total weight would you expect 70% of randomly chosen crews of four rowers to exceed? (ii) State what assumption you have made in answering this question and comment on whether you consider it reasonable.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

We are going to calculate the standard deviation for the following set of sample data. 13,9,11,13,5 1) First, calculate the mean. 2) Fill in the table below. Fill in the differences of each data value from the mean, then the squared differences. 3) Calculate the standard deviation. (x – a)² 13 9 11 13 Total Standard deviation: - Round to two decimal places S = п — 1
b. Using the values of the mean and standard deviation for persons with tertiary education, obtained in part 'a' sheet 3. Using Chebyshev' theorem, find at least what percentage of people in this group fell between +5 and -5 of the mean.
2. What is the difference between the standard deviation and the coefficient of variation? When is it more appropriate to use each measure?
4. The variance of a data set is 3410.56. Find the standard deviation for the data set. This ample of
1. "The weights of 1,000 children, in average, is 45kg with standard deviation of 18kg. Suppose the weights are normally distributed, how many children weigh between 53kg and 58kg?"a. 670b. 236c. 94d. 764
Baby weights: The weight of male babies lessthan 2 months old in the United States is normally distributed with mean 12.3 pounds and standard deviation 4.7 pounds. Use the TI-84 Plus calculator to answer the following. (a) What proportion of babies weigh more han 12 pounds? (b) What proportion of babies weigh less than 15 pounds? (c) What proportion of babies weigh between 9 and 13 po (d) Is it unusual for a baby to weigh more than 18.1 pounds Round the answers to four decimal places.
2. The population standard deviation for the age of Fictional College students is 8.4 years. If we want to be 95% confident that the sample mean age is within one year of the true population mean age of Fictional College students, how many randomly selected Fictional College students must be surveyed?
Mr 8. The results for an IQ quiz taken by 8 students from Ze Class A and Class B are shown below. The fal maximum score for the quiz is 25. we Class A: 4, 6, 6, 7, 8, 10, 11, 12 Class B: 0, 1, 1, 2, 3, 14, 17, 25 (i) Calculate the mean and standard deviation for Class A and Class B. Show your working clearly.
2) A psychology teacher decided to fail 12% of her class of 40 students. The exam results of the class were roughly normally distributed with a mean of 74 and a standard deviation of 7. A. What score must a student get in order to pass? B. How many students would get a score between 77 and 85?
4. You want to estimate the mean weight loss of people one year after using the Atkins diet. How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.20 lb of the true population mean? Assume that the population standard deviation is known to be 10.8 lb.
42. The speeds of vehicles on a certain part of a highway are normally distributed with a mean of 60 mph and a standard deviation of 6 mph. Use the Empirical Rule to answer the following questions. a. Approximately what percentage of vehicles travel at a speed between 54 mph and 66 mph? b. Approximately what percentage of vehicles travel at a speed greater than 72 mph? c. Approximately what percentage of vehicles travel at a speed not greater than 78 mph?