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  1. help me with this standard deviation question

    [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 ...