a. What is the probability that a laser fails before 6060 hours?  b. If 9 lasers are used in a product and they are assumed to fail  independently, find the standard deviation of the average lifetime of  these lasers. (unit: hours)   c. If 9 lasers are used in a product and they are assumed to fail independently, what is the probability that there are exactly 4 lasers failing before 6060 hours?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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Question 2:
The lifetime of a semiconductor laser at a constant gower is normally distributed with a mean of 6950 hours and a standard deviation of 620 hours. 
 a. What is the probability that a laser fails before 6060 hours?
 b. If 9 lasers are used in a product and they are assumed to fail  independently, find the standard deviation of the average lifetime of  these lasers. (unit: hours) 
 c. If 9 lasers are used in a product and they are assumed to fail independently, what is the probability that there are exactly 4 lasers failing before 6060 hours?

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