When data has been grouped, the average value cannot be found exactly as the individual values in each class are not known.

Grouping continuous data Continuous data can take any value so before representing it in a table or chart, it must be grouped into distinct class intervals ... .

NCERT Exemplar Problems and Solutions for CBSE Class 10 Mathematics chapter 13, Statistics and Probability is available here. Here you will get solutions to problems in exercise 13.2 of class 10 ...

I outline a general class of hazard models for grouped duration data based upon the choice of period-specific distribution functions, facilitating a thorough analysis of the implications of various ...