Question

If x and y are related as 4x – 3y = 10 and the mean deviation  of x is 10 then the mean deviation of y is _______ 

(a) 13 

(b) 12.3

(c) 13.3

(d) 13.5

Answer 1

The correct option  (c) 13.3  

Explanation:

4x – 3y = 10

∴ 3y = 4x – 10

i.e.       y = (4/3)x – (10/3)

∴ MD of y = |(4/3)| MD of x ....... for y = a + bx, MD(y) = |b|MD(x)

∴ MD of y = (4/3) × 10 = (40/3)

∴ MD of y = 13.3.