Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Statistical.php
public static function AVERAGE(...$args)
    {
        $returnValue = $aCount = 0;

        // Loop through arguments
        foreach (Functions::flattenArrayIndexed($args) as $k => $arg) {
            if ((is_bool($arg)) &&
                ((!Functions::isCellValue($k)) || (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_OPENOFFICE))) {
                $arg = (int) $arg;
            }
            // Is it a numeric value?
            if ((is_numeric($arg)) && (!is_string($arg))) {
                if ($returnValue === null) {
                    $returnValue = $arg;
                } else {
                    $returnValue += $arg;
                }
                ++$aCount;
            }
        }

        // Return
        if ($aCount > 0) {
            return $returnValue / $aCount;
        }

        return Functions::DIV0();
    }
public static function AVERAGE(...$args)
    {
        $returnValue = $aCount = 0;

        // Loop through arguments
        foreach (Functions::flattenArrayIndexed($args) as $k => $arg) {
            if ((is_bool($arg)) &&
                ((!Functions::isCellValue($k)) || (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_OPENOFFICE))) {
                $arg = (int) $arg;
            }
            // Is it a numeric value?
            if ((is_numeric($arg)) && (!is_string($arg))) {
                if ($returnValue === null) {
                    $returnValue = $arg;
                } else {
                    $returnValue += $arg;
                }
                ++$aCount;
            }
        }

        // Return
        if ($aCount > 0) {
            return $returnValue / $aCount;
        }

        return Functions::DIV0();
    }
public static function AVERAGE ( ... $ args ) { $ returnValue = $ aCount = 0 ; // Loop through arguments foreach ( Functions :: flattenArrayIndexed ( $ args ) as $ k => $ arg ) { if ( ( is_bool ( $ arg ) ) && ( ( ! Functions :: isCellValue ( $ k ) ) || ( Functions :: getCompatibilityMode ( ) == Functions :: COMPATIBILITY_OPENOFFICE ) ) ) { $ arg = ( int ) $ arg ; } // Is it a numeric value? if ( ( is_numeric ( $ arg ) ) && ( ! is_string ( $ arg ) ) ) { if ( $ returnValue === null ) { $ returnValue = $ arg ; } else { $ returnValue += $ arg ; } ++ $ aCount ; } } // Return if ( $ aCount > 0 ) { return $ returnValue / $ aCount ; } return Functions :: DIV0 ( ) ; }
AVERAGE.

Returns the average (arithmetic mean) of the arguments

Excel Function:
AVERAGE(value1[,value2[, ...]])

@category Statistical Functions

@param mixed ...$args Data values

@return float
AVERAGE .