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An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 9. Find the probability that a random sample of 21 light bulbs will have a sample variance S² between 6.56 and 11.27.

An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 9. Find the probability that a random sample of 21 light bulbs will have a sample variance S² between 6.56 and 11.27.

A First Course in Probability (10th Edition)
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 firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 9. Find the probability that a random sample of 21 light bulbs will have a sample variance S² between 6.56 and 11.27.
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 9. Find the probability that a random sample of 21 light bulbs will have a sample variance S² between 6.56 and 11.27.
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