A student measures the thickness of a human hair by looking at it through a microscope of magnification \(100.\) He makes \(20\) observations and finds that the average width of the hair in the field of view of the microscope is \(3.5~\text{mm}.\) What is the estimate of the thickness of the hair?
1. \(0.0035~\text{mm}\)
2. \(0.0350~\text{mm}\)
3. \(0.1350~\text{mm}\)
4. \(0.2350~\text{mm}\)
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