Answered: Manufacturer A's television picture…

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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Question

c4. Manufacturer A's television picture tubes have a mean lifespan of 7.23 years and a standard deviation of 0.72 years; while those of manufacturer B have a mean duration of 6.46 years and a standard deviation of 0.44 years. What is the probability that a random sample of 38 kinescopes from manufacturer A will have a mean lifespan that is 1 year less than the mean lifespan in a sample of 42 kinescopes from manufacturer B?

Round your answer to four decimal places after the period.

Select one:

a. The probability is 0.9745

b. None of the above

c. The probability is 0.9554

d. The probability is 0.9841

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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