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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