{"blocks": [{"key": "8b9cc9d2", "text": "Scenario", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "26507ba7", "text": "Probability that an incoming friend request is from a fake account", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "6a619c39", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "287824f1", "text": "95% of accounts are real, 5% fake; fake accounts send 10× more friend requests than real ones. If you receive a friend request, what is the probability it is from a fake account?", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "c0b8fdc8", "text": "Hints", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "8c65d40d", "text": "Apply Bayes’ theorem: posterior ∝ prior × likelihood.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}