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in Economics by (60.1k points)

Calculate the SD of the following frequency distribution of heights of 30 persons by direct method.

Height (CM) No. of Persons
155 - 160 1
160 - 165 6
165 - 170 6
170 - 175 6
175 - 180 6
180 - 185 3
185 - 190 2

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The 30 persons by direct method.

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