code: private void obtainQualityMarks() {
          int total = 0;
          for (int i = 0; i < this.qualityScoresArray.length; i++) {
              total += this.qualityScoresArray[i];
              this.maximumQuality = Math.max(this.qualityScoresArray[i], this.maximumQuality);
              this.minimumQuality = Math.min(this.qualityScoresArray[i], this.minimumQuality);
          }
          this.averageQuality = (double) total / this.quality.length();
      }
docs: this method obtains the minimum, maximum, and average quality values from the quality scores array