b) The following table shows the time spent in reading a book by a group of standard sixstudents from Permata Primary School.Time (in minutes)30-3940-4950-5960-6970-79Number of students25161275iii) Calculate the mean and the standard deviation for the data above.iv) Estimate the percentage of students who spent more than one hour to read a bookusing the ogive in (i).v) The mean and variance of time to read a book by a group of students from BerlianPrimary School are 43.21 and 234.7 respectively. Determine which group of studentsis more consistent in the time spent reading a book.

Given: The data is as follows: Time (in minutes) Number of students 30-39 25 40-49 16 50-59…

Answered: The following table shows the time…

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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The one-way commuting times from home to work for all employees working at a large company have a mean of 34 minutes and a standard deviation of 8 minutes. a. Using Chebyshev's theorem, find the minimum percentage of employees at this company who have one-way commuting times in the following intervals. i. 14 to 54 minutes ii. 18 to 50 minutes b. Using Chebyshev's theorem, find the interval that contains one-way commuting times of at least 89% of the employees at this company.
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 8vmillion dollars and a standard deviation of 1.1million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 15%of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and quarters that are not. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.
Suppose that the daily viewing time is normally distributed with a mean of is 8.35 hours and a standard deviation of 2.5 hours. How many hours of television viewing must a household have in order to be in the top 3% of all television viewing households?
In a medical examination, 300 people undergo a height measurement and was found out that the average height of all are 150cm. If the standard deviation is 19, find the number of people that fall under the given conditions: With height less than 132cm. With height from 140 cm to 180 cm With height taller than 200 cm With height from 160cm to 195 cm With height from 150 cm to 200cm Determine the range of the height that includes the central 60% 45% of the people who undergo the medical examinations are qualified to be part of the varsity. What is the limit height to be part of the varsity?
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 9 million dollars and a standard deviation of 1.2 million dollars. One health care information systems company considers a quarter a “failure” if it’s sales level that quarter is in the bottom 15% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered “failure” by that company and quarters that are not. Carry your intermediate computations to atleast four decimal places and round your answer to one decimal place.
Assume that military aircraft use ejection seats designed for men weighing between 140.3lb and 207lb. If women's weight are normally distributed with a mean of 164.2lb and standard deviation of 47.1lb, what percentage of women have weights that are within those limits? Are many women excluded with those specifications? The percentage of women that have weights between those limits is
2) A manufacturer claims that the replacement time for their CD players has a mean of 7 years and a standard deviation of 1.4 years. If this is true, find the probability that a) one randomly selected CD player is replaced in 6.2 years or less b) in a random sample of 30 CD players, the mean replacement time is 6.2 years or less c) In part b), are the assumptions of the Central Limit Theorem satisfied? Explain
The following table gives the distribution by frequency of the income of Aling Aurora’s Sari-sari store in 30 days. Compute the standard deviation of the incomes.
Suppose that a researcher is interested in estimating the mean systolic blood pressure, μ of executives of major corporations. He plans to use the blood pressures of random sample executives of major corporations to estimate μ. Assuming that the standard deviation of the population of systolic blood pressures of executives of major corporations is 27 mm Hg, what is the minimum sample size needed for the researcher to be 95% confident that his estimate is within 4 mm Hg of μ ? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
what is the probability that the average length of hands is less than 187 for a group of 18 men. The mean is 188 and the standard deviation is 7.1 using the central limit theorem
Suppose that the quarterly sales levels among health care information systems companies are approximately normallydistributed with a mean of 11 million dollars and a standard deviation of 1.4 million dollars. One health care informationsystems company considers a quarter a "failure" its sales level that quarter is in the bottom 15% of all quarterly saleslevels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" bythat company and quarters that are not. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.
Consider that μ1 and μ2 are the true mean stopping distances for motorcycles at 30 mph equipped with two different sets of tires. Tire set 1 is more expensive, so we only want to buy them if there is strong evidence that there is a mean stopping distance of at least 3 ft shorter at 30 mph. For Tire set 1, after nine tests, we get an x-bar1 of 110 ft and an s1 of 5 ft. For Tire set 2, after eight tests, we get an x-bar2 of 120 ft and an s2 of 6 ft. Assume that the distributions of stopping distances are roughly normal. (a) Find a point estimate of μ1 – μ2. Is the estimate biased or unbiased? (b) Find the estimated standard error the point estimate of μ1 – μ2? (c) Formulate and test the appropriate hypothesis at the α = 0.05 level.

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