Answered: appears that people who are mildly…

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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It appears that people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking. Among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately Normally distributed with 374374 minutes and standard deviation 6464 minutes. The mean number of minutes of daily activity for lean people is approximately Normally distributed with 522522 minutes and standard deviation 104104 minutes. A researcher records the minutes of activity for an SRS of 55 mildly obese people and an SRS of 55 lean people.

(a) What is the probability that the mean number of minutes of daily activity of the 55 mildly obese people exceeds 400400 minutes? (Enter your answer rounded to four decimal places.)

(b) What is the probability that the mean number of minutes of daily activity of the 55 lean people exceeds 400400 minutes? (Enter your answer rounded to four decimal places.)

probability:

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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