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Q: .
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  • A. 270
  • B. 305
  • C. 245
  • D. 180
Correct Answer: Option C - Given – The number of lamps whose life time is more than 600 hours but less than 900 hours • 75 + 90 + 80 = 245
C. Given – The number of lamps whose life time is more than 600 hours but less than 900 hours • 75 + 90 + 80 = 245

Explanations:

Given – The number of lamps whose life time is more than 600 hours but less than 900 hours • 75 + 90 + 80 = 245