Find the standard deviation for the following data: xi38131823fi71015106
A
5.37
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B
15.92
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C
6.12
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D
13.87
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Solution
The correct option is C 6.12 xififixix2ifix2i3721963810806464013151951692535181018032432402361385293174Total=486149652
Now, σ=1N√N∑fix2i−(∑fixi)2=148√48×9652−(614)2=148×293.77=6.12