Question

Positive numbers a1, a2, .... a5 are in geometric progression. Their mean and variance are $\frac{31}{10}$ and $\frac{m}{n}$ respectively. The mean of the reciprocals is $\frac{31}{40}$, then m + n is?

• A. 209
• B. 211
• C. 113
• D. 429

Answer 1

Answer: (B)

211

Answer 2

The correct answer is option (B) : 211