A certain type of light bulb has an average life of 1900 hours with a...
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A certain type of light bulb has an average life of 1900 hours with a standard deviation of 50 hours The length of life of the bulb can be closely approximated by a normal curve An amusem buys and installs 30 000 such bulbs Find the total number that can be expected to last less than 1960 hours Click here to view page 1 of the Areas under the Normal Curve Table Click here to view page 2 of the Areas under the Normal Curve Table The number of light bulbs that can be expected to last less than 1960 hours is BEEB
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