SOLUTION: The lifetime of a particular type of light-bulb has been shown to follow a Normal distribution with mean lifetime of 1000 hours and standard deviation of 125 hours. Three bulbs are
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Question 1176046: The lifetime of a particular type of light-bulb has been shown to follow a Normal distribution with mean lifetime of 1000 hours and standard deviation of 125 hours. Three bulbs are found to last 1250, 980 and 1150 hours. Convert these values to standardized normal scores Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! z=(x-mean)/sd
so for 1250, it is (1250-1000)/125 or +2
980 is -20/125 or -0.16
1150 is 150/125=+1.25
