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

$30-0=30$

$Q_3-Q_1=15-5=10$

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

$\pm 7$

$1.5*IQR=1.5*10=15$

$Q_1-15=5-15=-10$

$Q_3+15=15+15=30$

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

$\sigma$

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

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