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December 21, 2014

December 21, 2014

Posted by **Anonymous** on Wednesday, March 27, 2013 at 9:40am.

- statistics -
**Friend anonymous**, Wednesday, March 27, 2013 at 10:34amIt has to be 21

- statistics -
**helpus**, Wednesday, March 27, 2013 at 11:17amwhy 21?

- statistics -
**xstatistics**, Wednesday, March 27, 2013 at 6:08pm22.95

- statistics -
**EDXProfessor**, Thursday, March 28, 2013 at 12:23am80% is between -1.2815 and 1.2815 in standard units

90% is between -1.96 and 1.96

15/r.m.s. error = 1.2815

score/r.m.s. error = 1.96

=> score = 15*1.96/1.2815

Now, when rounding 1.2815 to either 1.281 or 1.282 you'll get slightly different result

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