Class A has the smallest spread in scores. The correct answer is option A.
Class A has the smallest spread in scores, as its box is the narrowest. The interquartile range (IQR), which is the range between the first and third quartiles, is also smallest for Class A. This means that there is less variability in the scores for Class A compared to the other classes.
The other classes have larger IQRs, which means that there is more variability in their scores. For example, Class D has the largest IQR, which means that there is a wider range of scores in Class D than in any of the other classes.
The median score is also different for each class. The median score is the middle score when the data is ordered from least to greatest. The median score for Class A is the highest, followed by Class B, Class C, and then Class D. This means that Class A had the highest overall scores on the exam.
So, the correct answer is Class A has the smallest spread in scores, the highest median score, and the least variability in scores.
Therefore the correct answer is option A.
The complete question could be