1 year consists of 365 days 1 day has 24 hours, each hour has 60 minutes and each minute has 60 seconds This gives the number of seconds in an hour as 60*60 = The value of the normal random variable is 365 days The mean is equal to 300 days The standard deviation is equal to 50 days We enter these values into the Normal Distribution Calculator and compute the cumulative probability The answer is P( X < 365) = 090 Hence, there is a 90% chance that a light bulb will burn out within 365 days The difference in speed between days per year and 360 days per year is equal to 96 minutes per day This is not a difference in our 24hour time period but it would take the earth 96 minutes less time per day to travel that same distance in the orbit around the sun days 96 minutes per day = 360 days
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