Find median, in this group median is 1
find Q1 which is median of lower half, in this group Q1 = 1/4
find Q3, which is median of upper half, in this group Q3 = 5/4
IQR is Q3-Q1
IQR = 5/4 - 1/4 = 4/4 = 1
You can easily test this if you know that (6, -10) corresponds to (X, Y). Knowing this, you can:
X = 6
Y = -10
you put this into your equation:
-10 = 3*6 - 8
calculate it:
-10 = 18 - 8
-10 = 10
This is not true of course, -10 is not equal to 10. Therefore, (6, -10) is not a solution of y = 3x-8 :)
9 * m = 45
divide both sides by 9:-
m = 5
2 * ( x - 15 ) = 1.5 * x
2x - 30 = 1.5x
2x -1.5x = 30
0.5x = 30
x = 30/0.5
x = 60mph.
