it was estimated that if a person’s name appears on a hospital waiting list to volunteer on request, the probability of being called within a month is 0.3. The hospital's list has 30 names. Assume that the chances of different people being called are independent. a) Find the probability that at least a third of the people on this list will be called up within a month. (i got 0.41119 from: (1-P(X<=9) ) b) What is the probability that at least a third of the people on this list will be called within a month, given that seven people have already been called?