In a grouped data, gretest value = 21 lowest value =3, and number of interval =3 thent he size of the class is.

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12 + 3 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

In a grouped data, gretest value = 21 lowest value =3, and number of interval =3 thent he size of the class is.

18

21

6

3