Question

The value of co-variance of two variables x and y is $- \frac{148}{3}$ and the variance of x is $\frac{272}{3}$and the variance of yis $\frac{131}{3}$. The coefficient of correlation is

• A. 0.48
• B. 0.78
• C. 0.87
• D. None of these

Answer 1

Answer: (D)

None of these

Answer 2

We know that coefficient of correlation $= \frac{Cov(x,y)}{\sigma_{x}.\sigma_{y}}$

Since the covariance is – ive.

∴ Correlation coefficient must be – ive. Hence (4) is the correct answer.