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Descriptive Statisticsmedium
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Two company departments have:

  • Department A (nA=30n_A = 30nA​=30 employees): mean salary = $65,000, variance = $20,000,000
  • Department B (nB=50n_B = 50nB​=50 employees): mean salary = $55,000, variance = $36,000,000

What is the combined overall mean salary across both departments?