Recognizing the normal distribution

The normal distribution is commonly observed in the real-world, such as shoe size, adult height, birth weight of babies, and IQ scores; therefore, it is important to be able to recognize this distribution when visualizing data.

Here is a grid of four plots displaying the distribution of schools achieving various percentages of pass grades for secondary school exams in the United Kingdom, where each visualization represents students from a different ethnicity.

Your task is to identify which of these plots does not represent a normal distribution.