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The class marks of a distribution are an arithmetic sequence: 13, 21, 29, 37, ...
If the distribution has 6 classes, what is the class mark of the last (6th) class?

Class 9Frequency PolygonsStatistics and Probability
  • A53
  • B58
  • C48
  • D106

Step-by-Step Solution

Common difference (class size) = 21 - 13 = 8. 6th term = 13 + (6-1)x8 = 13 + 40 = 53.
Answer: A) 53

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