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Math Help - How many given mean and 1SD?

  1. #1
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    How many given mean and 1SD?

    There are 200 students in a class when they have a test.

    If the average mar was 29.8 / 50, and the SD was 10 marks, how many students scored 45 or above?

    If anyone can run me through how to do this problem without having any statistics knowledge would be appreciated.
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  2. #2
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    Quote Originally Posted by Peleus View Post
    There are 200 students in a class when they have a test.

    If the average mar was 29.8 / 50, and the SD was 10 marks, how many students scored 45 or above?

    If anyone can run me through how to do this problem without having any statistics knowledge would be appreciated.
    You can probably use the rule explained here: 68-95-99.7 rule - Wikipedia, the free encyclopedia
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