Consider the following frequency distribution for the next three (03) items follow :

Class	0-20	20-40	40-60	60-80	80-100
Frequency	17	p + q	32	p - 3q	19

 

The total frequency is 120. The mean is 50.

What is the value of q ?

Consider the following frequency distribution for the next three (03) items follow :

Class	0-20	20-40	40-60	60-80	80-100
Frequency	17	p + q	32	p - 3q	19

 

The total frequency is 120. The mean is 50.

If the frequency of each class is doubled, then what would be the mean?