Determine the standard deviation and sample mean

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Reference no: EM13139176

A company that produces AA batteries makes the following statistical announcement: "Our AA batteries last 7.5 hours plus or minus 20 minutes, and our confidence in that interval is 95%.". They tested a random sample of 40 batteries using a special device designed to imitate real-world use and recorded data on battery lifetime.

Determine the sample mean (in minutes).

Determine the standard deviation.

Reference no: EM13139176

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