If `x_i` and `f_i` are numerically large numbers, then which methods are appropriate to use?

If x_1 and f_i are sufficiently small, then which method is an appropriate choice?

Which method is used to produce nitric acid ?

Give one example of a situation in which (i) the mean is an appropriate measure of central tendency. (ii) the mean is not an appropriate measure of central tendency but the median is an appropriate measure of central tendency.

In Column-I devices and in Column-II efficiency are given. Match them appropriately:

Force in Column -I and its use is in Column -II are given .Match them appropriately.