Answer variants:
150
100
110
120
135
Observe at the graph and complete the tabular column.
 
1276_19.svg
 
Class intervals
\(10\) - \(20\)
\(20\) - \(30\)
\(30\) - \(40\)
\(40\) - \(50\)
\(50\) - \(60\)
Frequency