SOLUTION: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.9 years, and standard deviation of 3.1 years.
The 4% of items with the shortest life
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The 4% of items with the shortest life
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Question 1145360: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.9 years, and standard deviation of 3.1 years.
The 4% of items with the shortest lifespan will last less than how many years? Answer by VFBundy(438) (Show Source):
You can put this solution on YOUR website! Go to a z-table and find the value that corresponds with a score of 0.04. The closest z-score is -1.75.
Cross-multiply:
x - 9.9 = -5.425
x = 4.475
The 4% with the lowest lifespan will last less than 4.475 years.
