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Agas station sold a total of 8019 gallons of gas on nine randomly picked days. Suppose the amount sold on a day is normally distributed

Agas 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 = 90.

Can you conclude that the true mean amount of gas sold on a day is less than 900 gallons?Use = 0.05

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