If 10% of products manufactured at a certain industry are defective, what is the probability that a random batch of 10 products from this industry contain: a) No defective products? b) At least 3 defective products? Suppose that phone calls to the President’s office at Lehman College arrive independently and at random, with outside calls arriving at an average rate of 3 in any 10 minute period, and inside calls at an average rate of 4 in any 10 minute period. Compute the probability that 2 or more calls arrive in any 2 minute period.