Refer to the credit card application approval process on page 213 where unusual values are defined. (a)

Question:

Refer to the credit card application approval process on page 213 where unusual values are defined.
(a) Show that if 4 is included as an unusual value, then the probability P[X < 4 or X > 13] is greater than .05.
(b) Show that if 12 is included as an unusual value, then the probability P[ X < 3 or X > 12] is greater than .05.