Twenty-four percent of executives say that older workers have blocked their career advancement.  You randomly select 12 executives and ask if they feel that older workers have blocked their career advancement.  To three significant figures, find the probability that the number who say older workers have blocked their career advancement is:

1. exactly four.
   {#1}
   
   
2. more than four.
   {#2}
   
   
3. between four and eight inclusive.
   {#3}