7. The mean of four numbers is 32. If one morenumber is added to the c

1.	7. The mean of four numbers is 32. If one morenumber is added to the collection, the new averageof the five numbers becomes 31. Find the meanvalue of fifth observation.
Answer» Since the mean of four numbers is 32. Therefore, the sum of all four numbers is (4×32)=128 Now,one more number is added then, The mean becomes 31. So,new sum of 5 numbers (5×31)=155 Therefore,the new number=155-128 =27

7. The mean of four numbers is 32. If one morenumber is added to the collection, the new averageof the five numbers becomes 31. Find the meanvalue of fifth observation.

Answer»

Since the mean of four numbers is 32.

Therefore, the sum of all four numbers is (4×32)=128

Now,one more number is added then,

The mean becomes 31.

So,new sum of 5 numbers (5×31)=155

Therefore,the new number=155-128

=27