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A gas station sold a total of 8019 gallons of gas on nine randomly picked days. Suppose the amount sold on a day is normally distributed with a true standard deviation σ = 90.
Construct a 99% confidence interval for the true mean μ.
Can you conclude that the true mean amount of gas sold on a day is less than 900 gallons? Use α = 0.05
Please show all work.
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