Question

The mean of three numbers is four what is the missing number

the two that are shown are 1 and 9
help

Answer 1

the answer is 2

Explanation:

1+2+9=12

12/3 = 4

mean = average and the average is 4

Answer 2

(1+9+x)/3=4 thus 10+x=12 x=2 number is 2