In a survey conducted by the Society for Human Resource Management, 68% of workers said that employers have the right to monitor their telephone use. When the same workers were asked if employers have the right to monitor their cell phone use, the percentage dropped to 52%. Suppose that 20 workers are asked if employers have the right to monitor cell phone use. What is the probability that:

a) 5 or less of the workers agree?

b) 10 or less of the workers agree?

c) 15 or less of the workers agree?