Computers consist of several components one of which is a memory. These memories, produced by an automatic process, have working life which is normally distributed with a mean of 500 hours and a standard deviation of 30 hours. If one thousand of these memories are selected at random from the production line, answer the following questions. (a) How many of the memories would you expect to last for longer than 550 hours? (b) How many memories would you expect to have a life of between 480 and 510 hours? (c) How many memories would you expect to have a life of more than 560 hours or less than 440 hours?
Computers consist of several components one of which is a memory. These memories, produced by an automatic process, have working life which is normally distributed with a mean of 500 hours and a standard deviation of 30 hours. If one thousand of these memories are selected at random from the production line, answer the following questions. (a) How many of the memories would you expect to last for longer than 550 hours? (b) How many memories would you expect to have a life of between 480 and 510 hours? (c) How many memories would you expect to have a life of more than 560 hours or less than 440 hours?
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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Transcribed Image Text:3. Computers consist of several components one of which is a memory. These
memories, produced by an automatic process, have working life which is normally
distributed with a mean of 500 hours and a standard deviation of 30 hours. If one
thousand of these memories are selected at random from the production line, answer
the following questions.
(a) How many of the memories would you expect to last for longer than 550 hours?
(b) How many memories would you expect to have a life of between 480 and 510
hours?
(c) How many memories would you expect to have a life of more than 560 hours or
less than 440 hours?
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