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Class Interval & 3 - 5 & 6 - 8 & ...

ClassInterval3568911Frequency222. Find the standard deviation of the above distribution.

A.

√5

B.

√6

C.

√7

D.

√2

Correct answer is B

ClassInterval3368911x4710f222fx81420|xˉx|2909|xˉx|218018

ˉx = fxf

= 8+14+202+2+2

= 426

ˉx = 7

S.D = f(xˉx)2f

= 18+0+186

= 366

= 6