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Mean: The mean of a data is the sum of the data entries divided by the number of entrie.
Standard Deviation: In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean. The standard deviation is a non-negative number that measures how far data values are from their mean.
Variance: The average of the "squared" differences from the Mean.
Frequency Distribution: The frequency distributions are helpful for computing the mean and standard deviation.
The Computational Formula: The Computational(Computing) Formula helps if data are not whole numbers and the mean is not one decimal.