Suppose the line of best fit is drawn for some data points. if the mean of the x-coordinates of the points is 10, and the mean of the y-coordinates of the points is -8, the line must pass through which of these points. a. (-8,10) b. (10,-8) c.(8,-10) d. (-10,8)

Answer with explanation:

Mean of the x coordinate of points =10

Mean of the y coordinate of point = -8

The answer can be proved by ,taking few points in the coordinate plane.

Let the points be, (1,2),(3,6),(5,10).

Mean of Abscissa and Ordinate

→→So,  If the mean of the x-coordinates of the points is 10, and the mean of the y-coordinates of the points is -8, the line will pass through = (10, -8)

Option B : (10 , -8)                      

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72