An industrial chemical to retard the spread of fire in paint has been developed. From past experience, 48% of sales calls will result in an order.
a) What is the probability that the first order will come on the fourth sales caqll of the day?
b) If eight sales calls are mad in a day, what is the probability of receiving exactly 6 orders?
c) If 4 sales calls are made before lunch, what is the probability that 1 or fewer results in an order?