A study of 420,046 cell phone users found that 140 of them developed cancer of the brain or nervous system. Prior to the study of the cell phone use, the rate of such cancer was found to be .0347% for those not using cell phones.

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False study.

Explanation: This is not true, and is purely by chance.

I hope this helped!

<!> Brainliest is appreciated! <!>

- Zack Slocum

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12.5 feet

step-by-step explanation: