Answered: 1.The heights of children in a second…

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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1.The heights of children in a second grade section are normally distributed with mean 52 inches and standard deviation 10 inches. What percentage of students will have height between 55 inches and 60 inches?

a. 0.5%

b. 5.0%

c. 12%

d. 17%

What is the 80th percentile of the variable mentioned in the question above?

a. 43.6

b. 60.4

c. 0.84

d. -0.84

If you take a random sample of 64 students in question 1, what would be the mean and standard deviation of the average height of these 64 students?

a. 52 inches and 10 inches

b. 6.5 inches and 1.25 inches

c. 6.5 inches and 10 inches

d. 52 inches and 1.25 inches

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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