Question

The Watts New Lightbulb Corporation ships large consignments of light bulbs to big industrial users.When the production process is functioning correctly which is 90% of the time,10%of all bulbs produced are defective.However the process is susceptible to an occasional malfunction leading to a defective rate of 50%.If a defective bulb is found what is the probability thatthe process is functioning correctly?If a nondefective bulb is found that is the probability that the process is operating correctly?