scr879

look at the Z value for for 1, its .8413,
84.13% probability that the snowfall amount in January next year will fall below 40 inches

find the z value for -1.65 which is .0495, meaning 4.95% chance snow will be below 26.75 inches next year.

So to find whats going down in between take the .8413-.0495=.79