Answered: Airlines must be aware of the weight of…

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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17. Airlines must be aware of the weight of the aircraft plus everything on board. Based on thousands of flights, the mean and standard deviation for the weights of several items are shown in the table. The weights of the airplane, people/luggage, and fuel are assumed to be independent.

Let the random variable T represent the total weight of the plane, people/luggage, and fuel for a randomly selected flight. Which of the following is closest to the standard deviation of T?

(A) 2.45 tons
(B) 4.00 tons
(C) 6.00 tons
(D) 75.0 tons
(E) 120 tons

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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