Matching percentiles on two curves

The curves show the marks of the \(200\) candidates who sat Test 1 and the \(160\) candidates who sat Test 2.

1. Amir scored \(60\) marks in Test 1. Find the percentage of Test 1 candidates who scored at most \(60\) marks.[1]
2. Find the Test 2 mark that has the same percentage of Test 2 candidates at or below it.[2]
3. Find the percentage of candidates in each test who scored more than \(80\) marks.[2]
4. Ben says, “\(20\) candidates scored more than \(80\) marks in Test 2 and \(10\) in Test 1, so a Test 2 candidate was twice as likely to score more than \(80\).” Explain whether his conclusion is justified.[2]