Suppose the average travel time for an employee at Waterman Electric is 10 min w

Question

Suppose the average travel time for an employee at Waterman Electric is 10 min with a standard deviation of 3 min.

A randomly chosen employee reports his travel time to be 5 minutes. Is the travel time for this employee unusual?

No, because 5 minutes is less than two standard deviations above the mean.

Yes, because 5 minutes is more than two standard deviations below the mean.

Yes, because 5 minutes is more than two standard deviations above the mean.

Yes, because 5 minutes is less than two standard deviations below the mean.

No, because 5 minutes is less than two standard deviations below the mean.

Explanation / Answer

here as lower unusaul value =mean -2*std deviation =10-2*3 =4

hence correct option is:

No, because 5 minutes is less than two standard deviations above the mean

also more than  two standard deviations below the mean

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