Question

If mean of 9,2,x and12 is 10, find x

Answer 1

Answer:

17 is the answer.

Step-by-step explanation:

Step 1: (9 + 2 + x + 12)/4 = 10         {we divided by 4 since there are 4 terms}

Step 2: (11 + x + 12) = 40

Step 3: 23 + x = 40

          => x = 40 - 23

          => x = 17.