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2. Log-normal distribution - Wikipedia

   en.wikipedia.org/wiki/Log-normal_distribution

   Then, the distribution of the random variable. is called the log-normal distribution with parameters and . These are the expected value (or mean) and standard deviation of the variable's natural logarithm, not the expectation and standard deviation of itself. Relation between normal and log-normal distribution.

3. Mode (statistics) - Wikipedia

   en.wikipedia.org/wiki/Mode_(statistics)

   Mode (statistics) In statistics, the mode is the value that appears most often in a set of data values. [1] If X is a discrete random variable, the mode is the value x at which the probability mass function takes its maximum value (i.e., x=argmaxxi P (X = xi)). In other words, it is the value that is most likely to be sampled.

4. Normal distribution - Wikipedia

   en.wikipedia.org/wiki/Normal_distribution

   Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is The parameter is the mean or expectation of the distribution (and also its median and mode), while ...

5. Median - Wikipedia

   en.wikipedia.org/wiki/Median

   Median. Finding the median in sets of data with an odd and even number of values. The median of a set of numbers is the value separating the higher half from the lower half of a data sample, a population, or a probability distribution. For a data set, it may be thought of as the “middle" value.

6. Arithmetic mean - Wikipedia

   en.wikipedia.org/wiki/Arithmetic_mean

   Definition. [edit] The arithmetic mean of a set of observed data is equal to the sum of the numerical values of each observation, divided by the total number of observations. Symbolically, for a data set consisting of the values , the arithmetic mean is defined by the formula: 2. (For an explanation of the summation operator, see summation.)

7. Mean - Wikipedia

   en.wikipedia.org/wiki/Mean

   Mean. A mean is a numeric quantity representing the "center" of a collection of numbers or the number that you can replace all the numbers in a data set by to still achieve the same total (the total is not necessarily the sum). [1] There are several kinds of means (or "measures of central tendency ") in mathematics, especially in statistics.