The z notation, z (a), combines two related concepts, the z-score and the area to the right, into a mathematical symbol. Identify the letter in each of the following as being a z-score or an area, and then with the aid of a diagram explain what both the given number and the letter represent on the standard curve.
a. z(A) = 0.10
b. z(0.10) = B
c. z(C) = - 0.05
d. -z(0.05) = D