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[If 'n' is added to each observation then'n' should also be added to the mean.] therefore: mean of 20 numbers = 59 {When 3 is added to each observation,the mean = 59+3} = 62 ------------------------------------------------------------------------------------------------------ [If 'n' is multiplied to each observation then'n' should also be multiplied to the mean.] 2) mean of 12 numbers= 48 {when each observation is multiplied by 4,then mean= 48*4 = 192

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

Thus when 3 is added to each number in the population having a mean of 59, the mean becomes 59 + 3 = 62.

Thus when each number in the population is multiplied by 4, then mean is multiplied by 4 ie., mean = 48 * 4 = 192