Question

a) The mean of the following distribution is 52 and the frequency of class interval 30-40 is 'f.
Find of
Class
10-20-20-30 30-40 40-50 50-60 60-70 70-80
Interval
3
7.
2
6
frequency
5​

Answer 1

here's the answer In the following frequency distribution, the frequency of the class interval (40-50) is not known. Find it, if the arithmetic mean of the distribution is 52.

Wages(Rs.)Number of Workes10−20 520−30 330−40 440−50 ?50−60 260−70 670−80 13

Question from  Class 11  Chapter Measures Of Central Tendency - Arithmetic Mean