Answer :

Here, we observe that, all 100 residents of a town have age equal and above 0. Since, 90 residents of a town have age equal and above 10.

So, 100 – 90 = 10 residents lie in the interval 0 - 10 and so on. Continue in this manner, we get frequency of all class intervals. Now, we construct the frequency distribution table.



Here, (assumed mean) a = 35


and (class width) h = 10


By step deviation method,



= 35 - 4 = 31


Hence, the required mean age is 31 yr.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
History - Concept and QuestionsHistory - Concept and QuestionsHistory - Concept and Questions57 mins
Trigo Marathon Part 1Trigo Marathon Part 1Trigo Marathon Part 146 mins
Heights and Distances - IIHeights and Distances - IIHeights and Distances - II45 mins
Heights and Distances - IHeights and Distances - IHeights and Distances - I54 mins
Trigo Marathon Part 2Trigo Marathon Part 2Trigo Marathon Part 245 mins
Arithmetic Progression and 'nth' Term of APArithmetic Progression and 'nth' Term of APArithmetic Progression and 'nth' Term of AP55 mins
Revision on Substitution and  Elimination MethodRevision on Substitution and  Elimination MethodRevision on Substitution and Elimination Method44 mins
Application of Trigo Important QuestionsApplication of Trigo Important QuestionsApplication of Trigo Important Questions44 mins
Economics - Concept and QuestionsEconomics - Concept and QuestionsEconomics - Concept and Questions59 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses