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using class intervals 1-5, 6-10, 11-15,....

using class intervals `1-5, 6-10, 11-15,........` construct the frequency distribution following data:

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arranging them in assending order.
1,2,6,6,7,8,8,9,9,11,11,12,12,12,13,14,16,17,18,18,18,19,21,22. number 1 to 5 are 2
number 6 to 10 are 7
number 11 to 15 are 8
number 16 to 20 are 6
number 21 to 25 are 2.
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