2019 RGS Y1 EYA Q17

The dot diagram shows the number of taxi rides taken by residents living in \(32\) regions in Singapore on a particular Tuesday. Each dot represents a region in Singapore and the number of taxi rides taken are rounded off to the nearest hundred. For example, the two dots on \(10\) represent two regions that had \(1000\) taxi rides on that Tuesday.

1. Using the rounded counts, how many regions have at least \(700\) taxi rides on that Tuesday?[1]
2. What is the percentage of regions where the rounded number of taxi rides ranges from \(400\) to \(800\) inclusively?[2]
3. State a possible reason for the \(2\) regions to have a rounded count of zero taxi rides.[1]