Mean + 1.96 SD include following % of values in a distribution: September 2012
Ans: D i.e. 95% 96 is the approximate value of the 97.5 percentile point of the normal distribution used in probability and statistics. 95% of the area under a normal curve lies within roughly 1.96 standard detions of the mean, and due to the central limit theorem, this number is therefore used in the construction of approximate 95% confidence intervals.
68%
99.50%
88.70%
95%