{
  "id": "S308",
  "type": "单选题",
  "type_code": "single",
  "stem": "根据经验法则，服从对称钟形分布的标准分数在[-3，+3]范围内的概率是（ ）。",
  "stem_text": "根据经验法则，服从对称钟形分布的标准分数在[-3，+3]范围内的概率是（ ）。",
  "options": [
    {
      "key": "A",
      "text": "0.5"
    },
    {
      "key": "B",
      "text": "0.68"
    },
    {
      "key": "C",
      "text": "0.95"
    },
    {
      "key": "D",
      "text": "0.99"
    }
  ],
  "options_text": [
    {
      "key": "A",
      "text": "0.5"
    },
    {
      "key": "B",
      "text": "0.68"
    },
    {
      "key": "C",
      "text": "0.95"
    },
    {
      "key": "D",
      "text": "0.99"
    }
  ],
  "answer_keys": [
    "D"
  ],
  "answer_display": "D",
  "answer_texts": [
    "0.99"
  ],
  "sources": [
    {
      "edition": "第17届",
      "edition_num": 17,
      "no": 35,
      "uid": "17-035",
      "file": "17届市调大赛本科组模拟题.docx"
    }
  ],
  "source_display": "第17届 第35题",
  "source_count": 1,
  "images": [],
  "warnings": [],
  "conflict": null,
  "url": "/q/S308.html"
}