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QUESTION 4 Historical data indicated that the time required to service the conveyor belt at Coca-Cola Amatil's Richlands operations can be modelled as a normal

QUESTION 4

  1. Historical data indicated that the time required to service the conveyor belt at Coca-Cola Amatil's Richlands operations can be modelled as a normal distribution with a standard deviation of27.9 minutes. A random sample of31 services revealed a mean service duration of102 minutes. Determine a 90% confidence interval for the mean service time in minutes. State thelower bound of this interval correct to two decimal places.

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