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help me with this standard deviation question

by sharma1617 on 08-06-2010 at 09:42 PM
[QUOTE=sharma1617;808316]The fourth grade at school X is made up of 300 students who have a total weight of 21,600 pounds.
If the weight of these four graders has a normal distribution and standard deviation equals 12 pounds, approximately what percentage of the fourth graders weighs more than 84 pounds?

a 12%
b 16%
c 36%
d 48%
e 60%

need detailed explanation,,and also want to know what are bell curve questions and how it will relate

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