Decide whether the normal model is applicable

Use the normal model because the tallest bin is enough evidence; the other bin heights do not affect the decision

Use the normal model. The frequencies rise to one central peak and fall away on both sides. The outside pair has frequencies 2 and 2, and the next pair has frequencies 8 and 8; the central bin is 18. There is no non-zero bin separated from the main group by two empty bins

Do not use the normal model because the frequencies on each side must be exact mirror images; approximate balance is not enough