√5
√6
√7
√2
Correct answer is B
ClassInterval3−36−89−11x4710f222f−x81420|x−ˉx|2909|x−ˉx|218018
ˉx = ∑fx∑f
= 8+14+202+2+2
= 426
ˉx = 7
S.D = √∑f(x−ˉx)2∑f
= √18+0+186
= √366
= √6
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