Question

If the mean is 21 for the data what is the value of the missing number

21 29 18 14 ( ) 30 9

Answer 1

26 is the missing number.

Answer 2

Answer: 26

Step-by-step explanation

x = missing value

To find the mean, we add up the values. Then divide by the sample size (which in this case is n = 7)

Adding up the values gives us

21+29+18+14+x+30+9 = x+121

Divide that over the sample size n = 7 to get the mean 21.

(x+121)/7 = 21

x+121 = 7*21

x+121 = 147

x = 147-121

x = 26 is the missing number