find out the arithmetic mean with the help of assumed mean for the following frequency table :. no. of children in the family: 0,1,2,3,4,5,6. no. of families: 20,120,250,300,200,100,10 ?
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Step-by-step explanation:
the assumed mean be A=35
Marks Mid-value
(x) No. of students
(f) d=x−35 fd
0−10
10−20
20−30
30−40
40−50
50−60 5
15
25
35
45
55 5
10
25
30
20
10 −30
−20
−10
0
10
20 −150
−200
−250
0
200
200
∑f=100 ∑fd=−200
x
=A+
∑f
∑fd
=35+(
100
−200
)=35−2=33
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