How to conclude that the bulbs will last between range

Reference no: EM13130212

The mean life of a particular brand of light bulb is NOT normally distributed. It has been determined that the mean life is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of the bulbs will last between:

850 and 1150 hours
900 and 1100 hours
800 and 1200 hours
950 and 1050 hours

Reference no: EM13130212

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How to conclude that the bulbs will last between range : It has been determined that the mean life is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of the bulbs will last between?

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