The Most Important Distribution a Many real life distributions are approximately normal. such as height, EFV1, weight, IQ, and so on. a Many other distributions can be almost normalized by appropriate data transformation(e.g. taking the log).When log X has a normal distribution, X is said to have a lognormal distribution6 The Most Important Distribution  Many real life distributions are approximately normal. such as height, EFV1,weight, IQ, and so on.  Many other distributions can be almost normalized by appropriate data transformation (e.g. taking the log). When log X has a normal distribution, X is said to have a lognormal distribution