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

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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.
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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