Social & Preventive Medicine General 9d07e059 One standard detion in normal standard curve includes value- A 50% B 68% C 95% D 100% High-Yield Explanation Ans. is 'b' i.e., 68% o 1 SD includes ----> 68% of values o 2 SD includes ----> 95% of values o 3 SD includes ----> 99.7% of values