Here are the test marks of \(7\) girls and \(5\) boys.
Girls: 18; 10; 13; 16; 11; 15; 9.
Boys:10; 13; 9; 17; 19.
a)Find the median mark of girls \(=\) .
b)Find the mean mark of all the students \(=\) .
(Note: If the answer is whole number mention as it is. If not then round off the answer and submit in single decimal).