Below is the list of 19 useful statistical functions, please see below for details or check all Excel functions here:

FunctionFormula
Average FunctionAverage(Num1, Num2, …)
Averagea FunctionAveragea(Num1, Num2, …)
Averageif FunctionAverageif(Range, Criteria, [Range])
Averageifs FunctionAverageifs(Range, Range1, Criteria1, [Range2, Criteria2], …)
Concatenate FunctionConcatenate (Cell 1, Cell 2…)
Count FunctionCount(Value1, [Value2], …)
Counta FunctionCounta(Value1, [Value2], …)
Countblank FunctionCountblank(Range)
Count Cells that Contain a ValueCountif(Range, Criteria)
Countifs FunctionCountifs(Range 1, Criteria 1, Range 2, Criteria 2…)
Frequency FunctionFrequency(Data_Array, Bins_Array)
Large FunctionLarge(Array, K)
Max FunctionMax(Num1, [Num2], …)
Maxa FunctionMaxa(Num1, [Num2], …)
Median FunctionMedian(Num1, [Num2], …)
Min FunctionMin(Num1, [Num2], …)
Mina FunctionMina(Num1, [Num2], …)
Rank.Avg FunctionRank.Avg(Num, Ref, [Order])
Small FunctionSmall(Array, K)