Visualizing Data Spread and Central Tendency

Eighty students took a Mathematics examination which consisted of two papers.

Each paper was marked out of 100. The diagram below shows the cumulative frequency curve for Paper 1.

Cumulative frequency curve for Paper 1

1. Estimate
   1. the median mark,
   2. the interquartile range,
   3. the \(80^{\text{th}}\) percentile.
2. The box-and-whisker diagram below represents the result for Paper 2.
   
   State, with a reason, which you think was the more difficult paper.