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cumulative frequency number of students 80 70 60 50 40 30 20 10 Boundary : 9.5 14.5 19.5 24.5 29.5 34.5 39.5 The sample size

cumulative frequency number of students 80 70 60 50 40 30 20 10

Boundary : 9.5 14.5 19.5 24.5 29.5 34.5 39.5

The sample size is

. Round answer to the nearest ten.

(b) The first class interval is

-. Caution: Class interval, not class boundary, is required.

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