Question: The A launderette operates a large washing machine. When working properly the duration of each wash is normally distributed with a mean of 50 minutes.

The A launderette operates a large washing machine. When working properly the duration of each wash is normally distributed with a mean of 50 minutes. The manager tests the machine by carrying out 5 washes and obtains a sample average of 55 minutes with a standard deviation of 5 minutes. What is the probability of this result when the null hypothesis is true

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