The operations manager of a vehicle manufacturing plant in London wants to estimate the average size of an order received. An order is measured by the number of vehicles shipped. A random sample of 100 orders from dealerships had a sample mean value of 135 vehicles. Assume that the population standard deviation is 30 vehicles and that the order size is normally distributed.

Question: Estimate, with a 90% confidence, the mean size of orders received from all the manufacturer's customers (use the z - table, round off to the nearest whole number).

  • $\begingroup$ Is this homework? If so, add a self-study tag, and say what you've tried so far. $\endgroup$ – corey979 Apr 10 at 8:04

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