The frequency table shows the mass, in grams, of 80 parcels arriving at a post office.
a.
[1]
Complete the cumulative frequency table
| Mass (m m\,m g) | Cumulative Frequency |
|---|---|
| 0<m≤2000 < m \leq 2000<m≤200 | |
| 0<m≤4000 < m \leq 4000<m≤400 | |
| 0<m≤6000 < m \leq 6000<m≤600 | |
| 0<m≤8000 < m \leq 8000<m≤800 | |
| 0<m≤10000 < m \leq 10000<m≤1000 | |
| 0<m≤12000 < m \leq 12000<m≤1200 |
b.[2]
On the grid opposite draw a cumulative frequency graph for this information.
c.[2]
Use your cumulative frequency graph to find an estimate for the interquartile range.