4. The shelf life of a photographic film is of interest to the manufacturer. Assume that shelf life is normally distributed. The manufacturer observes the shelf life for the following 4 units chosen at random from the current production. . 108 134 124 116 (a) Find a 95% confidence interval for the average shelf life. (b) Assume the populaffon standard deviation of shelf life is 5 days. The manu- facturer observes other samples with 4 units each time, let s be the variance of the samples each time, find e such that P(s
4. The shelf life of a photographic film is of interest to the manufacturer. Assume that shelf life is normally distributed. The manufacturer observes the shelf life for the following 4 units chosen at random from the current production. . 108 134 124 116 (a) Find a 95% confidence interval for the average shelf life. (b) Assume the populaffon standard deviation of shelf life is 5 days. The manu- facturer observes other samples with 4 units each time, let s be the variance of the samples each time, find e such that P(s
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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![4. The shelf life of a photographic film is of interest to the manufacturer. Assume
that shelf life is normally distributed. The manufacturer observes the shelf life for
the following 4 units chosen at random from the current production.
108
134
124
116
(a) Find a 95% confidence interval for the average shelf life.
(b) Assume the populaffon standard deviation of shelf life is 5 days. The manu-
facturer observes other samples with 4 units each time, let s be the variance of
the samples each time, find e such that P(s <e) = 0.1.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F35329d60-85b5-42a1-af15-15923f3d5a18%2Fc524ea62-1456-4492-b969-8ca6cfe88941%2Ff2rn358_processed.jpeg&w=3840&q=75)
Transcribed Image Text:4. The shelf life of a photographic film is of interest to the manufacturer. Assume
that shelf life is normally distributed. The manufacturer observes the shelf life for
the following 4 units chosen at random from the current production.
108
134
124
116
(a) Find a 95% confidence interval for the average shelf life.
(b) Assume the populaffon standard deviation of shelf life is 5 days. The manu-
facturer observes other samples with 4 units each time, let s be the variance of
the samples each time, find e such that P(s <e) = 0.1.
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