Question

Mean of four observation is 12. If first, second, third and fourth observation are decreased by 1,2,3and 4 respectively,then find the new mean.

Answer 1

Answer:

According to me answer is 9.5

Step-by-step explanation:

Let those four observation be a,b,c and d

So (a+b+c+d)/4=12

i.e a+b+c+d=48

NOW new observations are a-1,b-2,c-3and d-4

Total deacrement 1+2+3+4=10

So new sum= 48-10=38

So 38/4 is the answer i.e 9.5