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=1778577105&Signature=UwH2iIBQverXwsXeiOFxanpASt5OgCQhBctO6GiAxyh5WOiuztVKxq4oFXV1sq~Vi2NF7VKyul6XpYs2A-SNWUqdGRmDub5pc~lo~6eYrbFBP-SYHFfZ4tdCQ1h-ILWQCdrSGaG1KQNwD5kwwAHVhUQx9QKrfbSInotj-lEi0YPP4ZdZakpURdA8CKY1kRQhs0drth99Ums7gFXTjv3RRGefSW21n2qSVLg6CwwNBWGklFX6C0~oLFIo1Aqtx-aF2s-ABVjv~P8mW5IFws9ha-j4MYsaIfKB1Pbn2dyCxFUHirJHGIryHPGOABXa2XV1VgnLvw1oKGvo3Ef-Mi0zNA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1778577105&Signature=u-bb7SUmxh0lyEO9TU2fhgwanZSvniCbJXMfFak-19uZVJnypiHHP7RM~~eQjYuyBT2~u7bRLTwZu-GjJI3SQsHknlbfTUUrtn6kBHhv3aCJfJDhhBdbsSr8rl9d~C3GKnfGBpUyWXSAKFjXg73BgMktG2ye-~oEPqtjjDBLgJ2Ep0CYA-~vNutUCai1wAaBSMPKnwt7Ej8Vj6iGuY8uqYRmJGGpz5j0zk30x-lPjBIEYmj2t2mVELErGOPungQEFmV7UrH28mgUYJ6koIhmkzoTDSVT2nPYsm45qvtqE-JermQHB0L9AFSaorUJVU23DDW7bPpd4LYR-JUExlKD7w__&Key-Pair-Id=K2W722D70GJS8W)
