Find out standard deviation to produce aa batteries

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Reference no: EM13108171

A company which produces AA batteries tests lifetime of random sample of 40 batteries using special device designed to imitate real-world use. Based on testing, company makes following statement: "Our batteries last the average of 430 to 470 minutes, and our confidence in that interval is 95%" Find out standard deviation and show work.

Reference no: EM13108171

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