Answer
$R=8550$
$s=3074.9$
$IQR=5954.5$
Work Step by Step
$R=largest~value−smallest~value=14050-5500=8550$
According to the previous question:
$x̅=mean=10178.9$
$s=\sqrt {\frac{Σ(x_i−x̅)^2}{n-1}}=\sqrt {\frac{(14050-10178.9)^2+(13999-10178.9)^2+(12999-10178.9)^2+(10995-10178.9)^2+(9980-10178.9)^2+(8998-10178.9)^2+(7889-10178.9)^2+(7200-10178.9)^2+(5500-10178.9)^2}{9-1}}=3074.9$
In ascendind order: 5500, 7200, 7889, 8998, 9980, 10995, 12999, 13999, 14050
$Q_1=\frac{7200+7889}{2}=7544.5$
$Q_3=\frac{12999+13999}{2}=13499$
$IQR=Q_3-Q_1=13499-7544.5=5954.5$
