A certain characteristic in a large population has a distribution that is symmetric about the mean M. If 68 percent of the distribution lies within one standard deviation D of the mean, what percent of the distribution is less than M+D?
Please show your work.
using standard normal distribution that would be 84%
as it is expected that 68% of the population is within 1 standard deviation, and if is symetric 34% would be above the mean that is 0.5
so add 34%+50% = 84%