# Statistics

###### Question:

The MacBurger restaurant chain claims that the waitingtime of customers for service is normally distributed, with a meanof 3 minutes and a standard deviationof 1 minute. Thequality-assurance department found in a sample of 50 customers atthe Warren Road MacBurger that the mean waiting time was 2.75minutes. At the .05significance level, can we conclude that themean waiting time is less than 3 minutes?

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