Answered: The life of Sunshine CD players is…

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

13.

The life of Sunshine CD players is normally distributed with a mean of 4.1 years and a standard deviation of 1.3 years. A CD player is guaranteed for 3 years. We are interested in the length of time a CD player lasts.

Using the Normal Distribution or Inverse Normal Distribution calculator where appropriate fill in the blanks:

http://onlinestatbook.com/2/ calculators/normal_dist.html or http://onlinestatbook.com/ 2/calculators/inverse_normal_ dist.html

1) Find the probability that a CD player will break down during the guarantee period. Round To one decimal place where appropriate.

P(x< )=

2) Find the probability that a CD player will last between 2.8 and 6 years. Round to 2 decimal places.

P( < x < )=

3) Fill in the blanks:

Find k where k is the 70th percentile of the distribution for the time a CD player lasts.

(Round to one decimal place if necessary)

P( x < k )=

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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