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July 28, 2015

Homework Help: maths

Posted by harish on Wednesday, February 13, 2013 at 5:18am.

An intelligence test used in a particular country has scores which are normally distributed with mean 100 and standard deviation 15.In a randomly selected group of 500 people sitting the test, estimate how many have a score

1)higher than 140,
2)below 120,
3)between 100 and 110,
4)between 85 and 90.

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