Hello,

Well, if this is what you got by using the Z table, then you know how to use it, because your answer is correct...

The z table represents the area bounded by the Gaussian curve, the x axis, the y axis and the line x=a, where a is the z value of the table.

So in fact, tables give you this probability :

Let a>0 and b<0. Let and be the z scores of a and b.