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An inclusive class is written as 21-30. For computing the median we must use its true (continuous) lower boundary instead of 21.
What is the true lower boundary of this class?

Class 10Median of Grouped DataStatistics and Probability
  • A20.5
  • B18.5
  • C22.5
  • D41

Step-by-Step Solution

To make classes continuous, subtract half the gap from the stated lower limit: 21 - 0.5 = 20.5. This 20.5 is the value of l used in the median formula.
Answer: A) 20.5

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