Reading Bivariate Table Cell Value

In a bivariate frequency distribution table of sales and advertisement expenditure of 20 firms, how many firms had sales between Rs 135–145 lakh AND advertisement expenditure between Rs 64–66 thousand?

Principle of Class Formation

According to the Recap section, classes should be formed in such a way that the class mark of each class comes as close as possible to:

Tally Marking Method

A tally mark is used in frequency distribution to count class frequencies. How are tallies counted when there are 16 values in a class?

India Population 2001

According to the population data provided, what was India’s population (in crores) in 2001?