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11. An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 6. Find the probability that a random sample of 25 light bulbs will have a sample variance S² between 3.462 and 10.745.

11. An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 6. Find the probability that a random sample of 25 light bulbs will have a sample variance S² between 3.462 and 10.745.

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.2: Expected Value And Variance Of Continuous Random Variables
Problem 10E
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11. Need help plz
11. An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 6. Find the probability that a random sample of 25 light bulbs will have a sample variance S² between 3.462 and 10.745. 12. An electrical firm manuf 800 hours, and a variance of P(S²>5)≈ 0.7? light bulbs that have a length life with normal distribution, and mean equal to 26 a large enough sample size if we want that the sample variance satisfies
Transcribed Image Text:11. An electrical firm manufactures light bulbs that have a length life with normal distribution, and mean equal to 800 hours, and a variance of 6. Find the probability that a random sample of 25 light bulbs will have a sample variance S² between 3.462 and 10.745. 12. An electrical firm manuf 800 hours, and a variance of P(S²>5)≈ 0.7? light bulbs that have a length life with normal distribution, and mean equal to 26 a large enough sample size if we want that the sample variance satisfies
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