is denoted by has value variance standard normal distribution 0 1 Alejandra Gonzalez-Beltran Orlaith Burke Philippe Rocca-Serra dnorm(x, mean = 0, sd = 1, log = FALSE) http://stat.ethz.ch/R-manual/R-patched/library/stats/html/Normal.html standard normal distribution is a normal distribution with variance = 1 and mean=0 we need to formally set value for mean and variance normal distribution expected value ready for release