Gibson (1986) Asked a Sample of College Students to Complete

Gibson (1986) asked a sample of college students to complete a self-esteem scale on which the midpoint of the scale was the score 108.He found that the average self-esteem score for this sample was 135.2, well above the actual midpoint of the scale.Given that the standard deviation of self-esteem scores was 28.15, what would be the z score for a person whose self-esteem score was 104.28?

A) -1.10
B) -0.85
C) 0.85
D) 1.10