if the mean of the observation is 12 .
find the value of
0-10
2
10-20
3
20-30
f
30-40
5
40-50
6
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f
i
f
i
x
i
0−10 5 5 25
10−20 15 x 15x
20−30 25 10 250
30−40 35 12 420
40−50 45 7 315
50−60 55 8 440
∑f
i
=42+x ∑f
i
x
i
=1450+15x
Mean=
∑f
i
∑f
i
x
i
⇒ 31.4=
42+x
1450+15x
⇒ 1318.8+31.4x=1450+15x
⇒ 16.4x=131.2
Answer:
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