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Consider a sample of nine wait times measured in seconds at a drive through coffee shop.

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Consider a sample of nine wait times measured in seconds at a drive through coffee shop. The sample mean is 95 and the sample standard deviation is 23.516. The population mean and standard deviation are 100 and 20 respectively.

What is the size of the sampling error in this case?
What is the probability that the average wait time would be less than 80 seconds?
What is the probability that the average wait time would be more than 109 seconds?
What is the probability that the average wait time would be between 90 and 95 seconds?
What is the probability that a customer waits more than 65 seconds?

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Solution Summary

The solution includes formulas and detailed step-by-step calculations for the given sampling error problem.

Solution provided by:
Anwesha Ghosh, MSc
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  • MSc, Osmania University
  • MSc, Indian Institute of Technology - Roorkee (I.I.T.-ROORKEE)
  • BSc, Banaras Hindu University
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