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Question

Number of persons living in a house is reported to be as under 500 houses in a village. Find the median number of persons in a house in the village.
Number of Persons in a House 1 2 3 4 5 6 7 8 9 10
Number of Houses 26 113 120 95 60 42 21 14 5 4

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Solution

No. of Persons in a House No. of Houses
(f)
Cumulative Frequency
(c.f.)
1
2
3
4
5
6
7
8
9
10
26
113
120
95
60
42
21
14
5
4
26
139
259
354
414
456
477
491
496
500
f = 500

Median = size of N+12thitem
or, Median = size of 500 + 12th item
or, Median = size of 250.5th item
Now, we need to locate this item in the column of Cumulative Frequency. The item just exceeding 250.5th is 259 (in the c.f. column), which is corresponding to 3.
Hence, median is 3.

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