The lengths of lumber a machine cuts are normally distributed with a mean of101inches and a standard deviation of0.5inch.(a) What is the probability that a randomly selected board cut by the machine has a length greater than101.17inches?(b) A sample of41boards is randomly selected. What is the probability that their mean length is greater than101.17inches? (a) The probability is ____.(Round to four decimal places as needed.)(b) The probability is ____.(Round to four decimal places as needed.)

Given data Normal distribution Mean = 101 inches Standard deviation = 0.5 inches

Answered: The lengths of lumber a machine cuts…

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

The lengths of lumber a machine cuts are normally distributed with a mean of

101

inches and a standard deviation of

0.5

inch.

(a) What is the probability that a randomly selected board cut by the machine has a length greater than

101.17

inches?

(b) A sample of

boards is randomly selected. What is the probability that their mean length is greater than

101.17

inches?

(a) The probability is ____.

(Round to four decimal places as needed.)

(b) The probability is ____.

(Round to four decimal places as needed.)

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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