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The marks of 40 students of Class 9 in Kolkata are grouped (class size 10). The frequency polygon passes through (5, 0), (15, 6), (25, 10), (35, 14), (45, 8), (55, 2), (65, 0).
What is the frequency of the class 40-50?

Class 9Frequency PolygonsStatistics and Probability
  • A16
  • B7
  • C8
  • D9

Step-by-Step Solution

Class 40-50 has class mark 45. The plotted point (45, 8) gives a frequency of 8.
Answer: C) 8

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