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Hello!! I have an upcoming exam for Stats class this Saturday so I kindly need your help!! So please if you can kindly explain, answer,

Hello!! I have an upcoming exam for Stats class this Saturday so I kindly need your help!! So please if you can kindly explain, answer, and add formulas to each question below!! Thank you so much!! I appreciate it!!

PS: there's nothing I have to change or add as this is the only questions i'm asking. thank you!

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