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Huge quantities of gasoline from refineries

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Tanker trucks are designed to carry huge quantities of gasoline from refineries to filling stations. A factory that manufactures the tank of the trucks claims to manufacture tanks with a capacity of 8550 gallons of gasoline. The actual capacity of the tanks is normally distributed with mean = 8544 gallons and standard deviation = 12 gallons.

  • What is the probability that a randomly selected tank will have a capacity of less than 8500 gallons? ______
  • A simple random sample of n = 20 tanks will be selected. Find the z-score corresponding to a sample mean capacity for 20 tanks of 8550. ______
  •  A simple random sample of n = 50 tanks will be selected. What is the probability that the mean capacity for these 50 tanks will be greater than 8540 gallons? ________ (Round all to three decimal places)

Reference no: EM131058178

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