Answer:
16
Step-by-step explanation:
Mean: Sum of numbers / Number of numbers
You will have 7 numbers, including the missing number.
Rearrange the formula to find the sum of the numbers
Sum of the numbers = Mean * Number of Numbers
Mean = 18 * 7
Mean = 136
Now minus all the numbers you have to find the missing number.
126 - 21 - 11 - 27 - 22 - 13 - 16 = 16
Your missing number is 16.
You can check if it's correct by finding the sum of the numbers and dividing it by 7.
Mean: Sum of numbers / Number of numbers
18 = 126 / 7
