The dot plot shows how Mr. Ruda’s class scored on a 5-point math quiz. Mr. Ruda described the data as having a spread from 0 to 5, a center of 3, two clusters, and a peak at 5. Where did Mr. Ruda make an error? Scores on the Math Quiz A dot plot going from 0 to 5. 0 has 3 dots, 1 has 5 dots, 2 has 5 dots, 3 has 0 dots, 4 has 3 dots, and 5 has 8 dots. The spread is from 0 to 8. The center is at 2. There is only one cluster. The peak is at 8.