Histograms, stem and leaf diagrams and box plots Quiz

1. A class 10 to 15 has frequency 20. Its frequency density is

• A. $100$
• B. $4$
• C. $20$
• D. $0.25$

2. For the 11 values 3, 5, 6, 8, 9, 11, 12, 14, 15, 17, 20, the median is

• A. $9$
• B. $11$
• C. $8$
• D. $6$

3. A box plot has $Q_1=20$, $Q_2=25$, $Q_3=40$. The distribution is

• A. symmetrical
• B. negatively skewed
• C. positively skewed
• D. uniform

4. In a histogram a bar of width 4 and height 3.5 represents a frequency of

• A. $14$
• B. $3.5$
• C. $7.5$
• D. $0.875$

5. The IQR of data with $Q_1=12$ and $Q_3=29$ is

• A. $41$
• B. $8.5$
• C. $14$
• D. $17$