Sprendimas: Qx9TWm - 1

s^² =

( (x1-x__v)^²+ (x2-x__v)^²+ (x3-x__v)^²)

/ (n-1)

s^² =

( (x1-x__v)^²+ (x2-x__v)^²+ (x3-x__v)^²)

/ (n-1)

$s^{2}$ = $\frac{(x1-x_{v})^{2}+(x2-x_{v})^{2}+(x3-x_{v})^{2}}{n-1}$

s^² =

x1^²

/ (n-1)

2* x1* x__v

/ (n-1)

3* x__v^²

/ (n-1)

x2^²

/ (n-1)

2* x2* x__v

/ (n-1)

x3^²

/ (n-1)

2* x3* x__v

/ (n-1)

$s^{2}$ = $\frac{x1^{2}}{n-1}-\frac{2\cdot x1\cdot x_{v}}{n-1}+\frac{3\cdot x_{v}^{2}}{n-1}+\frac{x2^{2}}{n-1}-\frac{2\cdot x2\cdot x_{v}}{n-1}+\frac{x3^{2}}{n-1}-\frac{2\cdot x3\cdot x_{v}}{n-1}$

s = saknis(

x1^²

/ (n-1)

2* x1* x__v

/ (n-1)

3* x__v^²

/ (n-1)

x2^²

/ (n-1)

2* x2* x__v

/ (n-1)

x3^²

/ (n-1)

2* x3* x__v

/ (n-1)

) $s$ = $\sqrt {\frac{x1^{2}}{n-1}-\frac{2\cdot x1\cdot x_{v}}{n-1}+\frac{3\cdot x_{v}^{2}}{n-1}+\frac{x2^{2}}{n-1}-\frac{2\cdot x2\cdot x_{v}}{n-1}+\frac{x3^{2}}{n-1}-\frac{2\cdot x3\cdot x_{v}}{n-1}}$