5. Two mark example problems II

1. If the arithmetic mean of \(7\) values is \(30\) and if each value is divided by \(3\), then find the arithmetic mean of new set of values.

 

Answer:

 

The arithmetic mean \(=\)

 

2. The average mark of \(25\) students was found to be \(78.4\). Later on, it was found that score of \(96\) was misread as \(69\). Find the correct mean of the marks.

 

Answer:

 

Mean \(=\)

 

(Note: Round off the answer to \(2\) decimal places.)