Answered: Suppose the amount of time that a…

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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Suppose the amount of time that a certain battery functions is a normal random variable with a mean 400 and a standard deviation of 40 hours. (Note that sum of two independent normal random variables is normal with mean equal to the sum of the two means and variance equal to the sum of the two variances.) The probability that the total life of two batteries will exceed 760 hours is given by 0.2389 0.7611 0.2611 0.3413

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 + ...

Expert Solution

Step 1

Given:

Population mean time $(μ) = 400$

Population standard deviation $(σ) = 40$

X_i ~N (400, 40²)

X₁ be the life of first battery

X₂ be the life of second battery

T be the total batter life.

T = X₁ + X₂

$T ~ N (400 + 400, 40^{2} + 40^{2}) T ~ N (800, 3200)$

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