Ex1:- 0.95 is the probability that a device will not fail under a given axial load. What is the probability among 16 devices at least three will fail? Find the mean , variance and the standard deviation Ex2:- In the bank , credit card allowance is checked for a customer, 20% was outstanding of the credit card balance. Assume the binomial distribution. For a sample of 20 customers what is the probability of finding 4 customers their credit card was outstanding the balance? Ex3:- Autos arrive at a toll plaza located at the entrance to a bridge at a rate of 20 per minute during the 5:00-to-6:00 . Determine the following probabilities assuming that auto has just arrived. a. What is the probability that the next auto will arrive within 2 minutes? b. What is the probability that the next auto will arrive within 3 minutes