Q $(4).$

a$.$ The table below shows the monthly average flow rates $(\frac{m^3}{s})$ measured at a stream gauge station. Draw the flow duration curve for this station and label the horizontal axis.

$\backslash$table$[[$October$,$November,December,January,February,March,April,May,June,July,August,September$],[50,100,150,200,200,350,450,250,200,100,50,50]]$

b$.$ Determine the flow rate that exists half of the time at this station.