Question 592583: I'm completely stuck!
"What is the chance that a randomly selected person spends less than 15 minutes commuting?"
The information provided is:
the average time people spend commuting to work each day is 25 minutes
the variance is 144
I found that the standard deviation is 12, but I can't figure out how to use this information to solve the question.
Help is greatly appreciated!
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! "What is the chance that a randomly selected person spends less than 15 minutes commuting?"
The information provided is:
the average time people spend commuting to work each day is 25 minutes
the variance is 144
I found that the standard deviation is 12,
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z(15) = (15-25)/12 = -10/12 = -5/6
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P(x < 15) = P(z < -5/6) = normalcdf(-100,-5/6) = 0.2023
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Cheers,
Stan H.
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