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13 July, 17:55

The life expectancy of a lightbulb is normally distributed with a mean of 1975 hours and a standard deviation of 25 hours what is the probability that a lightbulb last between 1 950 and 2050 hours

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  1. 13 July, 19:48
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    (1975-1950) / 25 = 25/25 = + 1
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