P is the probability a value from this distribution lies between a & b. za and zb represent the z-scores of a & b.
7
Expression 8: "P" equals Start integral from "z" Subscript, "a" , Baseline to "z" Subscript, "b" , Baseline , end integral, "N" left parenthesis, "x" , right parenthesis "d" "x"P=∫zbzaNxdx
equals=
0.8 1 8 5 9 4 6 1 4 1 20.81859461412
8
Expression 9: "z" Subscript, "a" , Baseline equals StartFraction, left parenthesis, "a" minus "m" , right parenthesis Over "s" , EndFractionza=a−ms
equals=
negative 1−1
9
Expression 10: "z" Subscript, "b" , Baseline equals StartFraction, left parenthesis, "b" minus "m" , right parenthesis Over "s" , EndFractionzb=b−ms