AVERAGEIF

test-values: A collection containing the values to be tested. test-values can contain any value.

condition: An expression that compares or tests values and results in the boolean value TRUE or FALSE. Condition can include comparison operators, constants, the ampersand concatenation operator, references, and wildcards. You can use wildcards to match any single character or multiple characters in the expression. You can use a ? (question mark) to represent one character, an * (asterisk) to represent multiple characters, and a ~ (tilde) to specify that the following character should be matched rather than used as a wildcard.

avg-values: An optional collection containing the values to be averaged. avg-values is a reference to a single collection of cells, which may contain only number values or boolean values.