AVERAGEIF(range,criteria,average_range)

Range  is one or more cells to average, including numbers or names, arrays, or references that contain numbers.

Criteria  is the criteria in the form of a number, expression, cell reference, or text that defines which cells are averaged. For example, criteria can be expressed as 32, "32", ">32", "apples", or B4.

Average_range  is the actual set of cells to average. If omitted, range is used.

Remarks

• Cells in range that contain TRUE or FALSE are ignored.
• If a cell in average_range is an empty cell, AVERAGEIF ignores it.
• If range is a blank or text value, AVERAGEIF returns the #DIV0! error value.
• If a cell in criteria is empty, AVERAGEIF treats it as a 0 value.
• If no cells in the range meet the criteria, AVERAGEIF returns the #DIV/0! error value.
• You can use the wildcard characters, question mark (?) and asterisk (*), in criteria. A question mark matches any single character; an asterisk matches any sequence of characters. If you want to find an actual question mark or asterisk, type a tilde (~) before the character.
• Average_range does not have to be the same size and shape as range. The actual cells that are averaged are determined by using the top, left cell in average_range as the beginning cell, and then including cells that correspond in size and shape to range. For example:

  If range is	And average_range is	Then the actual cells evaluated are
  A1:A5	B1:B5	B1:B5
  A1:A5	B1:B3	B1:B5
  A1:B4	C1:D4	C1:D4
  A1:B4	C1:C2	C1:D4