[" If "a=55.5,n=100" and "sum f(i)d(i)=6...

[" If "a=55.5,n=100" and "sum f_(i)d_(i)=60" ,then find "],[" the mean from the given data."],[[" (a) "67.5," (b) "56.1," (c) "77.5," (d) "47.5]]

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