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1. Find the sum of the deviations from the arithmetic mean for the following observations: \(21\), \(30\), \(22\), \(16\), \(24\), \(28\), \(18\), \(17\)
 
Answer:
 
The sum of deviations \(=\)
 
2. The arithmetic mean of \(6\) values is \(45\) and if each value is increased by \(4\), then find the arithmetic mean of new set of values.
 
Answer:
 
The arithmetic mean \(=\)