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April 16, 2014

Homework Help: Steve help!

Posted by Tina on Wednesday, November 28, 2012 at 11:46am.

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

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