Question

The Electroencephalogram (EEG) voltage measured by a test device is 2.4 µV, while the reference device measured it to be 3.0 µV. What is the percentage error of the test device?

• A. 25%
• B. 20%
• C. 10%
• D. 0.6%

Hint:

The percentage error can be calculated by comparing the difference between the measured and true values relative to the true value.

Answer 1

The Correct Option is B

The percentage error is calculated using the formula: \[ {Percentage error} = \frac{\left| {Measured value} - {True value} \right|}{{True value}} \times 100 \] Step 1: Substituting the given values: - Measured value = 2.4 µV (from the test device), - True value = 3.0 µV (from the reference device). Substituting into the formula: \[ {Percentage error} = \frac{\left| 2.4 - 3.0 \right|}{3.0} \times 100 = \frac{0.6}{3.0} \times 100 = 20% \] Step 2: Conclusion. The percentage error of the test device is 20%.