Let's analyze the box-and-whisker plots step by step to answer the questions.

1. Median test score (Question a):
   The median is represented by the line inside each box:

   • Class A: The median is at approximately 75.
   • Class B: The median is lower, approximately 70.
     Answer: Class A had a higher median test score.

2. Interquartile Range (IQR) (Question b):
   The IQR is the length of the box (distance between Q1 and Q3):

   • Class A: The box is smaller, indicating a smaller IQR.
   • Class B: The box is larger, indicating a larger IQR.
     Answer: Class B had a larger interquartile range (IQR).

3. Highest test score (Question c):
   The highest test score is indicated by the right whisker:

   • Class A: The highest score is 95.
   • Class B: The highest score is approximately 92.
     Answer: Class A had the highest test score.

4. Passing scores (above 70) (Question d):
   Scores above 70 are passing:

   • Class A: The entire box (middle 50%) and the right whisker are above 70. Most scores are passing.
   • Class B: The left whisker and part of the box are below 70. Fewer scores are passing.
     Answer: Class A had more passing scores.

Final Answers:

(a) Class A
(b) Class B
(c) Class A
(d) Class A

Would you like a deeper explanation of any part? Let me know!

Related Questions:

1. How do you calculate the interquartile range (IQR) for a boxplot?
2. What are the five-number summary components in a boxplot?
3. Why is the median a better measure of center for skewed data than the mean?
4. How can you identify outliers using a boxplot?
5. How would the boxplot change if a single very low test score were removed?

Tip: In a box-and-whisker plot, the length of the box gives the IQR, and whiskers show the range of the data excluding outliers.