Show that the diagonal of the rectangle divide it into four triangle of equal area.
Question
The area of the triangle formed by O (0, 0), A (4, 1) and B (–2, –5) such that the lenght of the perpendicular from origin to AB is 
units, is
the marks obtained by 10 students in an examination were as follow:70,65,68,70,75,73,80,70,83,86.Find mean deviation about the mean.
All videos are not there plz check once one video is two times of second part