Definitions Complement rule: P(A^(C))=P(not A)=1-P(A) Addition rule for disjoint or mutually exclusive events: P(A ∪ B)=P(A or B)=P(A)+P(B) Solution The probability is given in the row with z=1.0 and in the column with .00 of the normal probability table in the appendix, added to 0.5 (since the probability to the of 0 is equal to 0.5). P(z<= 1)=0.5+0.3413=0.8413 Use the complement rule: P(z>1)