Question

The mean of 15 numbers is 10, IF 3 is added to each of the first 10 numbers, the new mean becomes
12.​

Answer 1

Answer:

New Mean = 12

Step-by-step explanation:

Since, Mean of 15 numbers = Sum of 15 numbers ÷ Total number of observation (15)

Therefore, 10 = Sum/15

So, Sum = 150

Now, 3 is added to 10 numbers ; this means the total number added to the Sum is 30.

[ The number of observation does not change. ]

=> New sum = Sum + 30 = 150 + 30 = 180

=> New Mean = New sum ÷ 15 = 180/15

=> New Mean = 12

Hope it helps u !!!!!!!!