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Statistical functions (reference) - Microsoft Support
Lists all statistical functions, such as the AVERAGE, COUNTBLANK, and MEDIAN functions.

Load the Analysis ToolPak in Excel - Microsoft Support
Perform statistical and engineering analysis with the Analysis ToolPak. The Analysis ToolPak is a Microsoft Office Excel add-in program that is available when you install Microsoft Office or Excel.

LINEST function - Microsoft Support
This article describes the formula syntax and usage of the LINEST function in Microsoft Excel. The LINEST function calculates the statistics for a line by using the "least squares" method to calculate a straight line that best fits your data, and then returns an array that describes the line.

Use the Analysis ToolPak to perform complex data analysis
If you need to develop complex statistical or engineering analyses, you can save steps and time by using the Analysis ToolPak. You provide the data and parameters for each analysis, and the tool uses the appropriate statistical or engineering macro functions to calculate and display the results in an output table.

COUNTIF function - Microsoft Support
Use COUNTIF, one of the statistical functions, to count the number of cells that meet a criterion; for example, to count the number of times a particular city appears in a customer list. In its simplest form, COUNTIF says: =COUNTIF(Where do you want to look?, What do you want to look for?)

Analyze Data in Excel - Microsoft Support
Analyze Data in Excel empowers you to understand your data through natural language queries that allow you to ask questions about your data without having to write complicated formulas. In addition, Analyze Data provides high-level visual summaries, trends, and patterns. Have a question? We can answer it!

AVERAGE function - Microsoft Support
Returns the average (arithmetic mean) of the arguments. For example, if the range A1:A20 contains numbers, the formula =AVERAGE (A1:A20) returns the average of those numbers. AVERAGE (number1, [number2], ...) The AVERAGE function syntax has the following arguments: Number1 Required.

Count how often a value occurs - Microsoft Support
There are several ways to count how often a value occurs. Use the COUNTIF function to count how many times a particular value appears in a range of cells.

Create a box and whisker chart - Microsoft Support
Use the new box and whisker chart in Office 2016 to quickly see a graphical representation of the distribution of numerical data through their quartiles. Box and whisker charts are often used in statistical analysis.

What's New: Changes made to Excel functions - Microsoft Support
The following Statistical functions (reference) have been renamed so that they are more consistent with the function definitions of the scientific community and with other function names in Excel. The new function names also more accurately describe their functionality.