Question

The depth of the snow in my yard is normally distributed, with a mean of 2.5 inches and a standard deviation of 0.25 inches. What value is one standard deviation below the mean?

Answer 1

If you need to go one standard deviation below 2.5, all you have to do is subtract .25 from 2.5

   2.50
 - 0.25
_______
   2.25

It helps to add zeros if the different decimal points kind of confuse you