test-values…: Optionally include one or more additional collections containing values to be tested. Each test-values collection must be followed immediately by a condition expression. This pattern of test-values, condition can be repeated as many times as needed.
condition…: If an optional collection of test-values is included, condition… is an additional expression that results in a boolean value TRUE or FALSE. There must be one condition expression following each test-values collection; therefore, this function always has an odd number of arguments.
For each of the test-values and condition pairs, the corresponding (same position within the AVERAGEIF