In a normal curve, the area of one standard detion around the mean includes which of the following percent of values in a distribution-

- the area of either side of mean in normal distribution curve gives the confidence limit. - confidence limit is calculated from mean and standard detion. - In a normal curve, the area of one standard detion around the mean includes 68 percent of values in a distribution approximately. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:849