calculate the arithmetic mean from the following data
a. direct method b. assumed mean
x 5 10 15 20 25 30 35 40
f 5 7 9 10 8 6 5 2
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Answer:
x f fx
5 4 20
10 5 50
15 7 105
20 4 80
25 3 75
30 2 60
Total N=25 ∑fx=390
Arithmetic Mean,
x
ˉ
=
N
∑fx
=
25
390
=15.6
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