A Researcher Records the Number of Individual Instruments Identified by Students

Multiple Choice

A researcher records the number of individual instruments identified by students listening to a piece of classical music.He splits the data into quartiles and reports that students correctly identified 3 instruments at the 25th percentile,5 instruments at the 50th percentile,and 8 instruments at the 75th percentile.What are the IQR and SIQR for these data?

A) the IQR is 3;the SIQR is 1.5
B) the IQR is 2;the SIQR is 1.0
C) the IQR is 5;the SIQR is 2.5
D) There is not enough information to answer this question.