Simplify. (-5.12) - (-4.7) + (7.021)
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The standard deviation of a dataset is the square root of the variance.
The standard deviation of the same set of data is 4
The variance is given as:
Take the square root of both sides to calculate the standard deviation
Substitute 16 for .
So, we have:
Take the positive square root of 16
Hence, the standard deviation of the same set of data is 4
Read more about standard deviations at:
The area for a rhombus is 
. We have the area and the length of one of the diagonals, so we fill in accordingly: 
. 8x/2 = 4x, so now we have 16=4x. Divide both sides by 4 to get x = 4. It's not longer than 8, but it's the length of the other diagonal, for sure.