READ_ONLY_ACCESS
[
  {
    "id": "stats1-w09-000",
    "front": "Week 9 Diagnostic: For a discrete random variable X with PMF P(X=1) = 0.2, P(X=2) = 0.5, P(X=3) = 0.3, what is the value of the CDF F(2)?",
    "back": "Answer: 0.7 — F(2) = P(X <= 2) = P(X=1) + P(X=2) = 0.2 + 0.5 = 0.7."
  },
  {
    "id": "stats1-w09-001",
    "front": "Week 9 Diagnostic: Which of the following is NOT a property of a valid CDF F(x)?",
    "back": "Answer: C — A CDF is always non-decreasing and approaches 1 as x -> inf."
  }
]