A supervisor finds the mean number of miles that the employees in a 9the x has a line on top)department live from work. He finds X=2.9 and s=3. Which statement must be true?

Question

A supervisor finds the mean number of miles that the employees in a 9the x has a line on top)department live from work. He finds X=2.9 and s=3. Which statement must be true?
z376 is within 1 standard deviation of the mean.
z37 is between 1 and 2 standard deviations of the mean.
z37 is between 2 and 3 standard deviations of the mean.
z37 is more than 3 standard deviations of the mean.

bobpursley · Answer

If I had a clue what the z in the answers meant...

I am a little wondering how the mean can be 2.9, and the standard deviation be 3. That is somewhat like saying the mean exam score was 83, and the standard deviation was 494.