Which of the following class/classes in Tamil Nadu are/is treated as an untouchable class and have been exploited by higher class people?
Which of the following alternatives is true?
(i) The class mid-point is equal to
(a) The average of the upper class limit and the lower class limit
(b) The product of upper class limit and the lower class limit
(c) The ratio of the upper class limit and the lower class limit
(d) None of the above