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Question - Mean of Grouped Data

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Question

A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.

Number of plants0 - 22 - 44 - 66 - 88 - 1010 - 1212 - 14
Number of houses1215623

Which method did you use for finding the mean, and why?

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