Question

The class marks of the frequency distribution is 15,20,25,30......45. What is the class interval for class mark 45?​

Answer 1

Answer:

20 is the class mark for the class interval 17.5- 22.5

Answer 2

42.5 - 47.5 is the class interval for class mark 45 .

[ as ( 42.5 + 47.5 ) / 2 = 90 / 2 = 45 ]

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