PDF chapter test TRY NOW

1. Calculate the mean of the following distribution using Assumed Mean Method:
 
Class Interval\(0 - 10\)\(10 - 20\)\(20 - 30\)\(30 - 40\)\(40 - 50\)
Frequency\(5\)\(7\)\(15\)\(28\)\(8\)
 
Answer:
 
Mean \(=\)
 
2. Find the arithmetic mean of the following data using Step Deviation Method:
 
Age\(15 - 19\)\(20 - 24\)\(25 - 29\)\(30 - 34\)\(35 - 39\)\(40 - 44\)
No. of persons\(4\)\(20\)\(38\)\(24\)\(10\)\(9\)
 
Answer:
 
Mean \(=\)
 
(Note: Round off the answers to \(2\) decimal places.)