The table shows information about where students prefer to revise.
Library: 30, Home: 68, In class: 37
Ed draws this bar chart to represent the data.
Write down three mistakes he has made.

Carefully compare the data in the table with the bar chart Ed has drawn. 1. **Check Library:** The table says 30. The bar for Library goes up to the line for 30. This is correct. 2. **Check Home:** The table says 68. The bar for Home goes up to just below the 70 line. Each small grid square represents 2 units (10 units / 5 squares). The bar is at 68. Wait, the image shows the bar at 69. Let me re-examine. The grid lines are every 10, with 5 subdivisions. So each subdivision is 2. The bar for Home is at 68. Let me check the original paper. The bar for Home is at 69. The data is 68. So the bar height is wrong. 3. **Check In class:** The table says 37. The bar for "In class" is drawn at 36 (3 lines up from 30). This is incorrect. 4. **Check Labels:** Look at the axes. The horizontal axis is labelled with the locations. The vertical axis has numbers but no label to say what the numbers represent (e.g., "Frequency" or "Number of students"). This is a mistake. 5. **Check other features:** The title is clear. The bars have gaps between them, which is correct for a bar chart representing discrete categories. The bars should be of equal width. They appear to be. So, the three mistakes are: incorrect height for "Home", incorrect height for "In class", and a missing label on the vertical axis.