PDF chapter test TRY NOW

 Look at the graph and answer the questions that follow.
 
1276_16.svg
 
1. The total frequency value of class intervals \(20\) - \(30\) and \(30\) - \(40\) is .
 
2. The difference between the frequency values of class intervals \(20\) - \(30\) and \(30\) - \(40\) is .