数学検定準２級の過去問です。解き方が解らないので解説、解答お願いします！
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![統計検定準1級2021年6月の問6です。
[1]の解説で、1行目から2行目に変形できるのは... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1618288/thumb_l_webp_17082553993910.webp?Expires=1774807165&Signature=p23I5Idas8oYBVTWbG-gcwq0YqnBdZlht1FY-arSGYzXeNmQtBNTeKZmt5F703iDvnRqh6ORT4gn1LESe7qAEXTRGohJu8cwxVb0pBfN70U2HlCTJnsi5m066H6GeKMZPFxInpIa86rFtaGHJyiLOPpqCmPU9OK4CKD819KPY2RQ4L38TFm9153FEZl635NitRkua4P9aLLfAoYK2Q8XZDM33qu8htTBCJE337DVyV7cnkkIEYpKtJ1OXdihayOKsW6dMIGQW06SLjEWNaIJZ6fouFahDc0gX2zW4LwnxqTFRSM1jaPgLNcCT2NJJI-Ogekz8mTxaT5ITG3DWXaVlA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1774807165&Signature=H4lwC6JUGbdaelpmWWpkxYpvLW99DEpUDTP5MPPc7bLwAsqxVgyUZg7~1EmfXC6WSX2plPhrw-3b0rCJQK9E4S1pFTdNQJlGYWpMMJI8NA~fh8lfW7bykMZdtzDJbTqKxUXJ0QyjcxPxpuOB5M~GdwI9kDsIuxuHqteJSU-xlZY3rKXoj0vDYAqB2J~Lv-IZIKoXUAxmzwjdfzPK~9uZBpgRXV3Llxd99OKwpzswFPdsAe2dPAmsJLMVeqDH1kZL5dOB-c3YVnKBmXHsj6DVw10rYblEA-fWOZB1YZJH06Ch~YGh7HY3LWR7Q3NRqYtRokCsWQrIn9CSjL65QIL33A__&Key-Pair-Id=K2W722D70GJS8W)
