Standard Deviation (S.D) for two observations 1 and 4 is / » Fundamentals of Business Statistics solved MCQs / By admin Question: Standard Deviation (S.D) for two observations 1 and 4 is A. 1 B. 1.5 C. 2 D. 3 Answer» b. 1.5 Note: The above multiple-choice question is for all general and Competitive Exams in India.