Two percent of the bulbs produced by a factory are not usable .Find the smallest number of bulbs that must be examined so that the probabiltiy of obtaining at least one non-usable bulb exceeds 0.5 .

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- January 13th 2010, 03:47 AMthereddevilsbulb probability
Two percent of the bulbs produced by a factory are not usable .Find the smallest number of bulbs that must be examined so that the probabiltiy of obtaining at least one non-usable bulb exceeds 0.5 .

- January 13th 2010, 03:58 AMmr fantastic