Q7 of 71 Page 199

The mean weight of 25 students of section A of a class is 51 kg. while the mean weight of 35 students of section B is 54 kg. Calculate the mean weight of 60 students of the class.

We know that,


Where, = Mean, xi = observations and n = no. of observations.





⇒ = 52.75


∴ mean weight of 60 students = 52.75


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