The mean life of a particular brand of light bulb is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of this brand of bulbs will last between O 1050 and 1250 hours 950 and 1050 hours O 900 and 1100 hours 850 and 1150 hours O 800 and 1200 hours

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Question 31

The mean life of a particular brand of light bulb is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least
89% of this brand of bulbs will last between
1050 and 1250 hours
950 and 1050 hours
900 and 1100 hours
850 and 1150O hours
800 and 120O hours
Transcribed Image Text:The mean life of a particular brand of light bulb is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of this brand of bulbs will last between 1050 and 1250 hours 950 and 1050 hours 900 and 1100 hours 850 and 1150O hours 800 and 120O hours
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