Refer to Exercise 4.87. Use the complementation rule to find the probability that a randomly selected U.S. senator is
In E 4.87
According to the Congressional Directory, the official directory of the U.S. Congress, prepared by the Joint Committee on Printing, the age distribution for senators in the U.S. Congress as of Fall 2013, is as shown in the following table.
Age (yr) ________________No. of senators
Under 50 ........................... 11
50-59 ............................... 30
60-69 ............................... 37
70-79 ............................... 20
80 and over ......................... 2
a. 50 years old or older.
b. Under 70 years old.