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Question

Find the mean of the following data using assumed mean method:
1179583_d625216de1184ac2addcfbbdedef16c1.jpg

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Solution

Here, A=42
Classes Classmark
xi
fi di=xiA fidi
24.529.5 27 14 15 210
29.534.5 32 22 10 220
34.539.5 37 16 5 80
39.544.5 42 6 0 0
44.549.5 47 5 5 25
49.554.5 52 3 10 30
54.559.5 57 4 15 60
fi=70 fidi=395
Mean=A+fidifi

=42+(395)70
=425.64
=36.36


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