User:CommonMaster

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{\bar x}={{\Sigma x} \over n}={492 \over 50}={9.84}

30-0=30

Q_3-Q_1=15-5=10

N_{av}={{\Sigma x} \over {n}}

\pm 7

1.5*IQR=1.5*10=15

Q_1-15=5-15=-10

Q_3+15=15+15=30

\sigma = \sqrt {{(x_1-\bar {x})^2+(x_2-\bar {x})^2+...+(x_n-\bar {x})^2} \over {n}} \approx {8.083}

\sigma

{\bar x \pm \sigma} \approx {9.84 \pm 8.083} \approx {17.923, 1.757}

{margin_{error}} \approx {\pm {1 \over {\sqrt n}}} \approx {\pm {1 \over {\sqrt {50}}}} \approx 0.141 \approx 14.14%

Help:Displaying a formula