well what u do is when people say a number squared they are saying to times the number thet u are sqaring by itself so 15x15 would be 225 as we have times 15 by itself
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The variance.
6.25
Two.Two.Two.Two.
The standard deviation is defined as the square root of the variance, so the variance is the same as the squared standard deviation.
1. 1x1=1