The mean of the data set is 18. What number is missing from the series of 21 11 27 22 13 16

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