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A survey was conducted by a group of stu...

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 plants:     0-2    2-4    4-6    6-8    8-10    10-12   12-14` `Number of houses:     1       2        1       5        6           2          3` Which method did you use for finding the mean, and why?

Text Solution

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`x_i = 1,3,5,7,9,11,13`
`f_i = 1,2,1,5,6,2,3`
`f_ix_i= 1, 6,5,35,54,22,39`
`sum f_i = 20`
`sum f_ix_i= 162`
mean`= (sum f_ix_i)/(sum f_i)`
`=162/20=8.1`
answer
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