from company A and 200 devices from company B. Calculate the probability that the difference between average life of the sample from company A and of the sample from company B is between 100 and 200 hours.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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An electrical appliance made by company A has an average life of 2500 hours, with a
standard deviation of 500 hours. Another company B makes this appliance with an
average life of 2300 hours, and a standard deviation of 800 hours. We take 300 devices
from company A and 200 devices from company B. Calculate the probability that the
difference between average life of the sample from company A and of the sample from
company B is between 100 and 200 hours.
O 0.9418
None of the other options
O 0.0582
0.4418
Transcribed Image Text:An electrical appliance made by company A has an average life of 2500 hours, with a standard deviation of 500 hours. Another company B makes this appliance with an average life of 2300 hours, and a standard deviation of 800 hours. We take 300 devices from company A and 200 devices from company B. Calculate the probability that the difference between average life of the sample from company A and of the sample from company B is between 100 and 200 hours. O 0.9418 None of the other options O 0.0582 0.4418
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