If the mean of the distribution is 2.6, then the value of y is
$\begin{array}{cccccc}\text{Variate x}& 1& 2& 3& 4& 5\\ \text{Frequency f of x}& 4& 5& y& 1& 2\end{array}$

Construct a grouped frequency distribution table for this data, using class intervals of size $0.5$ starting from the interval $2-2.5$.