Given a Normal Distribution with a Mean of 80 and a Standard

Multiple Choice

Given a normal distribution with a mean of 80 and a standard deviation of 20, an observation of x = 50 corresponds to a standard normal deviate:

A) of z = +1.5
B) of z = +3.0
C) of z = -1.5
D) of z = -3.0
E) of none of these