=+73. An insurance company offers its policyholders a number of different premium payment options. Let x denote the number of months between successive payments chosen by a policyholder. For any particular number k, the proportion of x values that are at most k

(i.e., # k) is called a cumulative proportion.Consider the following cumulative proportions: 0 for x , 1, .30 for 1 , # x , 3, .40 for 3 # x , 4, .45 for 4 # x , 6, .60 for 6 # x , 12, and 1 for x $ 12.