questions:
  - id: sample-mean
    question: "What is mean(c(2,4,6))?"
    answers:
      - text: "4"
        correct: true
      - text: "6"
        correct: false
    tags: [statistics, sample]
    difficulty: easy
    language: en
    explanation: "Arithmetic average"
    hints:
      - "Add and divide by length"
