Sign Up

Can you find the missing number in the list by using the mean of the numbers?

What is the missing number?

Step 1: Let us call the missing number N.

Step 2: We know, Mean = (Sum of all numbers)/(Number of numbers);

Therefore, Sum of all numbers = Mean x Number of numbers

i.e., 1 + N + 3 + 4 + 5 = 3 x 5 = 15

Step 3: N + 13 = 15 (Add all numbers except the unknown N)

Step 4: N + 13 – 13 = 15 - 13 (Subtract 13 from both sides)

Step 5: N = 2 (The missing number)

EZSchool^{ ®} is federally registered and protected trademark. Copyright @ 1998-2023 Asha Dinesh