Q. Marks secured by 42 students in Economics are: 
Marks  15 20 22 23 27 35 18
Number of Students 8 4 7 3 8 7 5
Find average marks.

Q. Average age of the people of a country is shown in the following table:
Age (years) 10-20 20-30 30-40 40-50 50-60
People('000) 30 32 15 12 9
Find out mean age by Direct Method.

Q. Calculate the arithmetic mean of the following frequency distribution by Direct Method:
Class Interval 10-20 20-40 40-70 70-120 120-200
Frequency 4 10 26 8 2






 

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