(1)P(X<60)
=Φ[(60-66.33)/2.882]
=Φ(-2.20)
=1-Φ(2.2)
=1-0.9861
=0.0139
(2)P(X>69)
=1-P(x≤69)
=1-Φ[(69-66.33)/2.882]
=1-Φ(0.93)
=1-0.8238
=0.1762
(2)P(60≤X≤69)
=1-P(X<60)-P(X>69)
=1-0.0139-0.1762
=0.8099
(1)P(X<60)
=Φ[(60-66.33)/2.882]
=Φ(-2.20)
=1-Φ(2.2)
=1-0.9861
=0.0139
(2)P(X>69)
=1-P(x≤69)
=1-Φ[(69-66.33)/2.882]
=1-Φ(0.93)
=1-0.8238
=0.1762
(2)P(60≤X≤69)
=1-P(X<60)-P(X>69)
=1-0.0139-0.1762
=0.8099