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1. Construction of a cumulative frequency table is useful in determining the 
 
 
2. In the following distribution: 
 
Monthly income range (in Rs) Number of families
Income more than \(₹ 10000\) \(100\)
Income more than \(₹ 13000\) \(85\)
Income more than \(₹ 16000\) \(69\)
Income more than \(₹ 19000\) \(50\)
Income more than \(₹ 22000\) \(33\)
Income more than \(₹ 25000\) \(15\)
 
the number of families having income range in \(₹ 16000-19000\)  is