GCSE Maths Practice: averages

Question 12 of 13

Find the missing number given the mean and other numbers.

\( \begin{array}{l}\text{The mean of six numbers is 9. Five numbers are: 7, 8, 10, 12, 6. Find the sixth number.}\end{array} \)

Choose one option:

Double-check the sum of known numbers before subtracting.

Use formula: missing = total - sum of known values.