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NCERT Class XI Mathematics - Statistics - Solutions

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Question : 2
Total: 34
38, 70, 48, 40, 42, 55, 63, 46, 54, 44
Solution:  
Mean of the given data is
−
x
 =
38+70+48+42+55+63+46+54+44
10
=
500
10
 = 50
xi 38 7048404255 63 46 54 44Total
|xi−50|12 20 2 10 8513 4 4 6 84

∴ M.D. about mean =
1
n
n
Σ
i=1
|xi−
−
x
| =
1
10
×84=8.4
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