Consider the following for the next three (03) items that follow :

The algebraic sum of the deviations of a set of values x₁, x₂, x₃, ⋯, x_n measured from 100 is -20 and the algebraic sum of the deviations of the same set of values measured from 92 is 140.

What is the algebraic sum of the deviations of the same set of values measured from 99?

Consider the following for the next three (03) items that follow :

The algebraic sum of the deviations of a set of values x₁, x₂, x₃, ⋯, x_n measured from 100 is -20 and the algebraic sum of the deviations of the same set of values measured from 92 is 140.

If the algebraic sum of the deviations of the same set of values measured from y is 180, then what is the value of y ?

Consider the following data for the next three (03) items that follow :

The marks obtained by 51 students in a class are in AP with its first term 4 and common difference 3.

What is the mean of the marks ?

Consider the following data for the next three (03) items that follow :

The marks obtained by 51 students in a class are in AP with its first term 4 and common difference 3.

What is the median of the marks?