medium · GMAT Quant
A semiconductor plant analyzes wafer thickness deviations across two manufacturing lines. Line A processes 40 wafers with a mean thickness deviation of 5 micrometers. Line B processes 60 wafers with a mean thickness deviation of 10 micrometers. The sum of squared deviations within Line A is 450, and within Line B is 750.
What is the total sum of squared deviations (mathrmSST) across all 100 wafers?
- 1800
- 1200
- 600
- 2400
- 1825
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