Asurvey asked a group of people the size of their households. the results are shown in the frequency distribution.
what is the mean of the frequency distribution?
household size 1 2 3 4 5
f 3 4 6 7 5
25
16.4
5
3.28

Household size (x)                 Frequency (f)                    fx
            1                                           3                            1 × 3 = 3
            2                                          4                            2 × 4 = 8
            3                                          6                            3 × 6 = 18
            4                                          7                            4 × 7 = 28
            5                                          5                            5 × 5 = 25

Total of fx (Σfx) = 3 + 8 + 18 + 28 + 25 = 82
Total frequency (Σf) = 3 + 4 + 6 + 7 + 5 = 25
Mean = Σfx ÷ Σf = 82 ÷ 25 = 3.28

Correct option D

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