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Steve help!

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10,000 students took a math test. If there average score was 40 with standard deviation of 10, how many students must have scored between 20 and 40 marks?


3,772
2,227
5,000
3,334
4,772

  • Steve help! - ,

    20 is 2 std's out
    2 std's is 47.7%

    So, I'd pick 4772

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