Consider the class intervals 1-10, 11-20, 21-30, etc Here what is the class boundary of class interval 11-20?
11,20
11,19
10.5, 20.5
11.5, 19.5

11,19

11.5, 19.5

11,20

10.5, 20.5

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Consider the class intervals 1-10, 11-20, 21-30, etc Here what is the class boundary of class interval 11-20?
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11,19
10.5, 20.5
11.5, 19.5