Question

Mean of four observations is 12. If first, second, third and fourth observations are
decreased by 1, 2, 3 and 4 respectively, then find the new mean. (Ans. New Mean = 9.5​

Answer 1

Answer:

x-1+x-2+x-3+x-4÷4=12

x-1+x-2+x-3+x-4=12×4

4x-10=48

4x=48-10=38

x=38÷4

x=9.5

Answer 2

Answer:

9.5

Step-by-step explanation:

The answer for your q is given above.