The correct OPTION is (a) Coefficient of variation of weights > Coefficient of variation of heights

Easy explanation: X̄1 = 170, X̄2 = 55, σ1^2 = 130 and σ2^2 = 25.

Now, Standard Deviation = √Variance

⇒ Standard deviation of height, σ1^2 = 130 ⇒ σ1 = √130 ⇒ σ1 = 11.40

and Standard deviation of weight, σ2^2 = 130 ⇒ σ2 = √25 ⇒ σ2 = 5

Also, Coefficient of Variance = (Standard Deviation/Mean) × 100

⇒ Coefficient of Variation in heights = (σ1/X̄1) x 100 = (11.40/170) x 100 = 6.7

and Coefficient of Variation in weights = (σ2/X̄2) x 100 = (5/55) x 100 = 9.09.