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Q. The mean of a certain number of observations is 35. What is the new value of the mean if each observation is decreased by 30 %.
 

Dear Student,

Given: Mean = 35Let the total number of observations be n.Original Mean = Sum of observationsnumber of observationIt is given that each observation is decreased by 30%, i.e. the total sum of the observations will be decreased by 30%.New mean = 0.7×Sum of observationsnNew mean = 0.7 × Original meanNew mean = 0.7×35  = 24.5
Regards

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