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Only 4th part of this question

Plz tell its urgent Only 4th part of this question u eat;e frequency tabic Monthly earning (in s) 200-300 300—400 400-500 500-600 600 - 700 700 - 800 800-900 900-1000 15 10 5 8 6 6 7 3 9 Write the lower limit of the first class interval. i) Determine the class limits of the fifth class interval. Find the class mark of the seventh class interval. the class size.

Dear Student,

The difference between the successive lower limits or upper limits is called the class size.
In the given questionPartivClass size is-300-200=100400-300=100 and so onHence Class Size is 100
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 Class Size = 100
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Class mark =850
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