According to a survey published by compsych corporation, 54% of all workers read e-mail while they are talking on the phone. suppose that 20% of those who read e-mail while they are talking on the phone write personal "to-do" lists during meetings. assuming that these figures are true for all workers, if a worker is randomly selected, determine the following probabilities:

a. the worker does not write personal "to-do" lists given that he reads e-mail while talking on the phone.
b. the worker does not write personal "to-do" lists given that he reads e-mail while talking on the phone.
c. the worker does not write personal "to-do" lists and does read e-mail while talking on the phone.