The working life of a certain electrical equipment is normally distributed with a mean of 180 days and a standard deviation of 4 days. For each of the following questions, construct a normal distribution curve and provide the answer.About what percent of the products last between 176 and 184 days?About what percent of the products last between 180 and 184 days? For each of the following questions, use the standard normal table and provide the answer.About what percent of the products last 172 or less days? About what percent of the products last 184 or more days? The working life of a certain electrical equipment is normally distributed with a mean of180 days and a standard deviation of 4 days.For each of the following questions, construct a normal distribution curve and provide theanswer.About what percent of the products last between 176 and 184 days?About what percent of the products last between 180 and 184 days?For each of the following questions, use the standard normal table and provide the answer.About what percent of the products last 172 or less days?About what percent of the products last 184 or more days?

Answered: The working life of a certain…

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 working life of a certain electrical equipment is normally distributed with a mean of 180 days and a standard deviation of 4 days.

For each of the following questions, construct a normal distribution curve and provide the answer.

About what percent of the products last between 176 and 184 days?

About what percent of the products last between 180 and 184 days?

For each of the following questions, use the standard normal table and provide the answer.

About what percent of the products last 172 or less days?

About what percent of the products last 184 or more days?

The working life of a certain electrical equipment is normally distributed with a mean of
180 days and a standard deviation of 4 days.
For each of the following questions, construct a normal distribution curve and provide the
answer.
About what percent of the products last between 176 and 184 days?
About what percent of the products last between 180 and 184 days?
For each of the following questions, use the standard normal table and provide the answer.
About what percent of the products last 172 or less days?
About what percent of the products last 184 or more days?

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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