Question 284762: assuming that the weights of a newborn babies at a certain hospital are normally distributed with mean 6.5 pounds and standard deviation 1.2 pounds, how many babies in a group of 80 babies from this hospital will weigh more than 8.9 pounds?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! assuming that the weights of a newborn babies at a certain hospital are normally distributed with mean 6.5 pounds and standard deviation 1.2 pounds, how many babies in a group of 80 babies from this hospital will weigh more than 8.9 pounds?
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z(8.9) = (8.9-6.5)/1.2 = 2
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Use your z-chart or technology (EXCEL, calculator, or other means)
find the following:
P(z > 2) = normalcdf(2,100) = 0.02275..
I used a TI-84 to get my result.
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In a group of 80 you would expect (0.02275)80 =1.82 babies to
weigh more than 8.9 lbs.
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Cheers,
Stan H.
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