An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 7. Find the probability that a random sample of 21 light bulbs will have a sample variance S² greater than 13.15. Find the probability that a random sample of 40 light bulbs will have a sample variance S² of at most 5.88.
An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 7. Find the probability that a random sample of 21 light bulbs will have a sample variance S² greater than 13.15. Find the probability that a random sample of 40 light bulbs will have a sample variance S² of at most 5.88.
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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Transcribed Image Text:An electrical firm manufactures light bulbs that have a
length life with normal distribution, and mean equal to 800
hours, and a variance of 7.
Find the probability that a random sample of 21 light bulbs
will have a sample variance S² greater than 13.15.
Find the probability that a random sample of 40 light bulbs
will have a sample variance S² of at most 5.88.
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