Q: The standard deviation of the exponential distribution of f_X(x) = { λ e^{−λx}, x ≥ 0 { 0, x < 0 is
(a)1/λ
(b)2/λ²
(c)3/λ³
(d)2/λ³
Correct Answer: (a)
The correct answer is (a): 1/λ. Subject: Quantitative Aptitude & Data Interpretation | Sub-topic: Statistics & Probability Note: This answer was determined through AI-based research. Verify against the official answer key when available.