5103 The probability that a new light bulb will be defective

5.103 The probability that a new light bulb will be defective is 0.005. If a lot of 5000 light bulbs was purchased from the same company, what is the expected number of defective light bulbs in the lot? Spring 2015 Venkateswara Rao Mudunuru 5.113 A drugstore receives a shipment of sixty vials of a certain pharmaceutical. Previous experience indicates that such a shipment will result in about 2 percent of the vials being damaged. Find the expected number of undamaged vials in the shipment.

Solution

1 . P = 0.005 = X/5000 ; X = 5000 * 0.005 = 25 = expected number of detective light bulbs in the light .

2 . 2*60/100 =120/100 = 1.2 ; 60 - 1.2 = 58.8 = expected number of undamaged vials .