Question: Given the following data set: 12, 15, 20, 25, 30, calculate the interquartile range (IQR).
A) 10
B) 15
C) 12.5
D) 17.5
E) 7.5
Correct answer: A
Grade: 8 | Topic: Statistics and Probability | Difficulty: Medium | Standard: 8.SP.A.4