// If we have at least one grade.
			$count = count( $grades );
			if ( $count ) {

				$grade = round( array_sum( $grades ) / $count, 2 );

			} else {

				$grade = _x( 'N/A', 'overall grade when no quizzes', 'lifterlms' );

			}

			// Cache the grade.
			$this->set( 'overall_grade', $grade );

		}

		return apply_filters( 'llms_student_get_overall_grade', $grade, $this );

	}

	/**
	 * Retrieve a student's overall progress
	 * Overall progress is the total percentage completed based on all courses the student is enrolled in
	 * Cached data is cleared every time the student completes a lesson
	 *
	 * @param    boolean $use_cache  if false, calculates the progress, otherwise utilizes cached data (if available)
	 * @return   float
	 * @since    3.2.0
	 * @version  3.2.0
	 */
	public function get_overall_progress( $use_cache = true ) {

		$progress = null;

		// Attempt to pull from the cache first.
		if ( $use_cache ) {

			$progress = $this->get( $this->meta_prefix . 'overall_progress' );

			if ( is_numeric( $progress ) ) {
				$progress = floatval( $progress );
			}
		}

		// Cache disabled or no cached data available.
		if ( ! $use_cache || null === $progress || '' === $progress ) {

			$progresses = array();