COLLECT DATA OF NO. OF FAMILY MEMBERS OF 11 NEIGHBOURHOOD FAMILIES AND FIND MEAN, MODE, MEDIAN ?
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Answer:
Family size Number of families
1−3 7=f
0
3−5 8=f
1
5−7 2=f
2
7−9 2
9−11 1
∑f=20
Mode =l+
2f
1
−f
0
−f
2
f
1
−f
0
×h
Whereas,
l= Lower limit of modal class =3
h= Class interval =5−3=2
f
0
= frequency of class preceeding the modal class =7
f
1
= frequency of modal class =8
f
2
= frequancy of class succeding the modal class =2
Therefore,
Mode =3+
(2×8)−7−2
8−7
×2
=3+
16−9
1
×2
=3+
7
2
=3.286
Hence the mode of the given data is 3.286.
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