In the graph below, a normal distribution is shaped like a bell, hence its nickname the bell curve, with the middle of the curve representing the mean.

When and why do you use lognormal distribution or normal distribution for analyzing securities? Lognormal for stocks, normal for portfolio returns.

For more information about the SPEC statement, see . The agreement between the empirical and the normal distribution functions in Output 2.1.1 is evidence that the normal distribution is an ...