DSSSB · Mathematics

There are 4 machines making widgets in a factory. Machine A makes 100 widgets at an average efficiency rate of 80, Machine B makes 150 widgets at an efficiency rate of 75, Machine C makes 200 widgets at an efficiency rate of 85 and Machine D makes 50 widgets at an efficiency rate of 90. Find the weighted average efficiency rating of the widgets produced.

  1. 78.5
  2. 83.0
  3. 81.5
  4. 80.0
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