20. Five mark example problem VI

The amount that the children have spent for purchasing some eatables in one day trip of a school are \(5\), \(10\), \(15\), \(20\), \(25\), \(30\), \(35\), \(40\). Using step deviation method, find the standard deviation of the amount they have spent.

 

Answer:

 

The standard deviation \(=\)