SOLUTION: The lifetimes of 20,000 light bulbs are normally distributed. The mean lifetime is 230 days. The standard deviation is 40 days. Find the values defined by the standard deviation in

Question 973213: The lifetimes of 20,000 light bulbs are normally distributed. The mean lifetime is 230 days. The standard deviation is 40 days. Find the values defined by the standard deviation in a normal distribution for 3 standard deviations.
Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
230 + 3(sd) = 230+3(40) = 350
230 - 3(sd) = 230-3(40) = 110
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