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The math problem in the second volume of the seventh grade is about straight edges.
1. Find range first = maximum number-minimum number = 24.4- 18.5 = 5.9.

2。 Determine the number and spacing of groups. Generally divided into about 5 groups. Therefore, the group spacing is 1 and the number of groups is = 6 (with formula).

3。 List the frequency promulgation tables: 18.45- 19.45, 19.45-20.45, 20.45-2 1.45, 22.

I made it myself.

Determine how many tons are suitable according to the model.

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