Simplify \(\left(\frac{3}{4} - \frac{1}{3}\right)\times 4\frac{1}{3}\div 3\frac{1}{4}\)

The table below gives the distribution of marks obtained by a number of pupils in a class test.

The mode of the distribution is

The table below gives the distribution of marks obtained by a number of pupils in a class test.

Find the median of the distribution

The table below gives the distribution of marks obtained by a number of pupils in a class test.

How many pupils scored at least 2 marks?