Question

# The marks scored by the students in a test are given below. x4681012f73595 Find the standard deviation of their marks by assumed mean method.5.223.912.874.48

Solution

## The correct option is C 2.87Let the assumed mean, A = 8 xifidi=xi−Afidifidi247−4−2811263−2−612850001092183612542080n=29∑fidi=4∑fidi2=240 Standard Deviation σ=√∑fidi2N−(∑fidiN)2  =√24029−(429)2=√694429×29 ⇒6≃2.87

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