mean of 4 observation is 12 if first second third and fourth observation are decreased by 1,2,3 and 4 respectively then find the new mean
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sum of all observations = 12 X 4
=48
total decrease =1+2+3+4 = 10
new sum of all observations = 48-10=38
new mean = sum of all observations / no . of observations
38/4= 9.5
=48
total decrease =1+2+3+4 = 10
new sum of all observations = 48-10=38
new mean = sum of all observations / no . of observations
38/4= 9.5
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