Mean life of electric bulbs produced by a company is 1500 hours with a standard deviation of 300 hours. Assuming that the life of bulbs follow Normal distribution, what is the probability that a randomly selected bulb will:
i) Fail within 1200 hours?
ii) Survive between 1350 and 1650 hours?
iii) Survive beyond 1950 hours?
9. Write short notes on Normal distribution