The table below shows the salaries of 280 persons

$\begin{array}{cc}Salary(Inthousand)& No.ofpersons\\ 5-10& 49\\ 10-15& 133\\ 15-20& 63\\ 20-25& 15\\ 25-30& 6\end{array}\phantom{\rule{0ex}{0ex}}\begin{array}{cc}30-35& 7\\ 35-40& 4\\ 40-45& 2\\ 45-50& 1\end{array}$

Calculate the median salary of the data,

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