r - 有没有办法跟踪使用 R 包学习器做出的正确回答的多项选择题的数量？

Question

我用 R 包“学习者”做了多项选择题。如何让 R 计算用户正确回答问题的数量？以下是部分代码：

question("Question 1. What is the mean of the data: 2, 5, 8, 8, 2, 5?",
    answer("3.5", message = "Try again."),
    answer("4", message = "Try again."),
    answer("4.5", message = "Try again."),
    answer("5", correct = TRUE, message = "Good job!"),
    answer("5.5", message = "Try again."),
    type = "single",
    allow_retry = TRUE
  )

question("Question 2. What is the mean of the data: 20, 50, 80, 80, 20, 50?",
    answer("35", message = "Try again."),
    answer("40", message = "Try again."),
    answer("45", message = "Try again."),
    answer("50", correct = TRUE, message = "Good job!"),
    answer("55", message = "Try again."),
    type = "single",
    allow_retry = TRUE
  )