Math Destroyer 2015 formula typo

[Ahmadtoo]

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I don't know if anyone else noticed this, but just make sure you change this on your formula sheet!

Page 11, the midpoint formula is incorrect. It has it as a product in the Y coordinate, it should be a sum.

M = (((X1+X2)/2),((Y1+Y2)/2))

Here's a picture in case in-text formulas are hard to understand:
https://burnsgeometry.wikispaces.com/file/view/Mid_point_formula.jpg/170463679/Mid_point_formula.jpg


*Side note: Be aware that the standard deviation formula given on page 9 is only for population questions!
For sample questions, the denominator should be n-1 instead of just n. So just depends on the question given, so make sure you pay attention and don't always use the population formula.
http://mathbitsnotebook.com/Algebra1/StatisticsData/popformula2.gif

Correct me if I'm wrong for any of this, good luck!

 

[DAT Destroyer]

I don't know if anyone else noticed this, but just make sure you change this on your formula sheet!

Page 11, the midpoint formula is incorrect. It has it as a product in the Y coordinate, it should be a sum.

M = (((X1+X2)/2),((Y1+Y2)/2))

Here's a picture in case in-text formulas are hard to understand:
https://burnsgeometry.wikispaces.com/file/view/Mid_point_formula.jpg/170463679/Mid_point_formula.jpg


*Side note: Be aware that the standard deviation formula given on page 9 is only for population questions!
For sample questions, the denominator should be n-1 instead of just n. So just depends on the question given, so make sure you pay attention and don't always use the population formula.
http://mathbitsnotebook.com/Algebra1/StatisticsData/popformula2.gif

Correct me if I'm wrong for any of this, good luck!

It has been corrected.

 

[Ahmadtoo]

@HiloH