Question

Chemistry	28	6	9	43	10	17	47	23	35
Biology	8	49	12	4	31	30	33	45	23

The marks obtained in Chemistry and Biology are as follows;

• A. $0.1$
• B. $-0.35$
• C. $-0.86$
• D. $0.78$

Answer 1

The correct option is B $-0.35$

$\rho =1-\frac{6\sum d^2}{n(n^2-1)}=\frac{6\times {162}^2}{9\times 80}=-0.35$