Correct Answer - Option 1 : 15x
Concept:
Coefficient of varience = \(\rm\frac{\text {standard deviation}}{\text{arithematic mean}}\times100 \)
Calculation:
CV = \(\rm\frac{SD}{AM}\times100 \)
⇒ 75x2 = \(\rm \frac{SD}{\frac{20}{X}} \times 100\)
⇒ SD = 15x
The correct option is 1 .