LOGNORMDIST

The LOGNORMDIST function in Excel, which has been replaced by LOGNORM.DIST in newer versions, is used to calculate the cumulative distribution function of a lognormal distribution. This function is crucial for analyzing data that follows a lognormal distribution, commonly found in fields such as finance, biology, environmental science, and engineering. LOGNORMDIST helps in modeling and understanding data such as investment returns, biological growth rates, and environmental contaminant levels. The function returns the probability that a log-normally distributed random variable is less than or equal to a specified value. The syntax for LOGNORMDIST is =LOGNORMDIST(x, mean, standard_dev), where "x" is the value at which to evaluate the function, "mean" is the mean of the natural logarithm of the distribution, and "standard_dev" is the standard deviation of the natural logarithm of the distribution. By providing a way to calculate cumulative probabilities, LOGNORMDIST aids in performing risk assessments, forecasting, and making informed decisions based on lognormal data distributions.