In case of normal curve, the limits mean +/- 2SD cover:: (A) 66%, (B) 78%, (C) 95%, (D) 99%
Answer is C. In case of normal curve, the limits mean +/- 2SD cover 95% of subjects, while mean +/- 3 SD covers 99.7% subjects. Ref: Medical biostatistics, 1st edition pg: 180