7. Calculate the mean deviation about the mean for the following data :
Class interval :
0-4
4 - 8
8 - 12
12 - 16
16 - 20
Frequency :
4
6
8
5
2
Answers
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Answer:
xifi fixi ∣xi−Mean∣ fi∣xi−Mean∣ 2 11 22 15.10 166.1 7 12 84 10.10 121.2 12 17 204 5.10 86.7 17 12 204 0.10 1.2 22 20 440 4.90 98 27 28 756 9.90 277.2n=n∑fixi=1001710=17.10
Mean about median=n∑fi∣xi−Mean∣=100750.4=7.54
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