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The classes of a distribution are given with inclusive limits 1-10, 11-20, 21-30, 31-40 and frequencies 4, 9, 12, 5. Using the correct (continuous) boundaries, the lower boundary of the median class is:

Class 10Median of Grouped DataStatistics and Probability
  • A41
  • B20.5
  • C22.5
  • D18.5

Step-by-Step Solution

. Cumulative: 4, 13, 25, 30. Median class is 21-30, whose true lower boundary is 21 - 0.5 = 20.5.
Answer: B) 20.5

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