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NCERT Class XI Mathematics - Statistics - Solutions

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Question : 1
Total: 34
4, 7, 8, 9, 10, 12, 13, 17
Solution:  
Mean of the given data is
−
x
 =
4+7+8+9+10+12+13+17
8
 =
80
8
 = 10
xi 4 78 91012 13 17 Total
|xi−10|6 3 2 1 023 7 24

∴ M.D. about mean =
1
n
n
Σ
i=1
|x1−
−
x
| =
1
8
×24 = 3
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