thank you but I need step text explanation can you do this please the sum is
in the class weight of students is measured for every class records calculate mean weight of the class students using assumed mean method
weight
weight in kg: 15-25,25-35,35-45,45-55,55-65,65-75
no.of.students:4,11,19,14,0,2
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Answer:
Weight
Mid
No. of
in
value
students
e.g.
(kg)
(x)
(f)
15 - 25
20 20
4
80
25 - 35
30
= 11
330
35 - 45
40
19
760
45 - 55
50
14
700
55 - 65
80 60
0
0
65 - 75
R 70
2
140
Σ fx =
Σ + = 50
2010
Arithmetic mean =
Σ fx
=
2010
50
= 40.2
Arithmetic mean = 40. 2
X
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