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Mathematics, 02.10.2019 03:30 anatomyfl
The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 50 hours. we can conclude that at least 75% of this brand of bulbs will last between
(a) 1100 and 1300 hours
(b) 1150 and 1250 hours
(c) 1050 and 1350 hours
(d) 1000 and 1400 hours
(e) 950 and 1450 hours
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