Calculate the standard deviation of the data as : 15,18,20,12,10,9,11
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Answer:
Answer
Correct option is
B
1.99
X f fx X-Mean f(X−x)
2
10 2 20 −4 32
11 7 77 −3 63
12 10 120 −2 40
13 12 156 −11 2
14 15 210 0 0
15 11 165 1 11
16 10 160 2 40
17 6 102 3 54
18 3 54 4 48
Total 76 fX=1064
f(X−X)
2
=300
−
X=
76
1064
=14
σx=
76
300
=
3.95
=1.99.
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