Q76

A table T1 in a relational database has the following rows and columns:

$$\begin{array}{|c|c|c|} \hline \text {Roll no. } & \text {Marks} \\\hline 1& 10 \\\hline 2 & 20 \\\hline3 & 30 \\\hline 4 & \text{NULL}\\\hline \end{array}$$

The following sequence of SQL statements was successfully executed on table T1. Update T1 set marks = marks + 5 Select avg(marks) from T1 What is the output of the select statement?