Q. The SD of 15 items is 6 and if each item is decreases by 1, then standard derivation will be
A) 5
B) 7
C) $\frac{91}{15}$
D) 6
Explanation
The correct answer is Option D: 6.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.