Solve for the following pair of equations to three figure accuracy 
Definitions:
Variability
The extent to which data points in a statistical distribution or data set diverge from the average value.
Brain Wave
Electrical patterns produced by the activity of the brain, often measured by electroencephalography (EEG).
High Amplitude
Refers to waves or signals with a large magnitude or intensity, often used in the context of sound, light, or electrical waves.
Electroencephalogram (EEG)
A test that measures electrical activity in the brain using small, metal discs attached to the scalp.
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