Answered: 10. The Postmaster of a city's Post…

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 Postmaster of a city's Post Office believes that a Normal model is useful in projecting the number of letters which will be mailed during the day. They use a mean of 20,000 letters and a standard deviation of 250 letters draw and clearly label this model.

STA 2023 Unit 1 Lab
10. The Postmaster of a city's Post Office believes that a Normal model is useful in projecting the
number of letters which will be mailed during the day. They use a mean of 20,000 letters and a
standard deviation of 250 letters. Draw and clearly label this model.
11. Light bulbs are measured in lumens (light output), watts (energy used), and hours (life). A
standard white light bulb has a mean life of 675 hours and a standard deviation of 50 hours. A
soft white light bulb has a mean life of 700 hours and a standard deviation of 35 hours. At a local
science competition, both light bulbs lasted 750 hours. Which light bulb's life span was better?
Explain.

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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