Question

The mean of the data set is 15. What number is mising 18,16,___,9,12,23

Answer 1

the missing number is 12

Explanation:

what divided by 6 (total # of values given) + 78 (sum of 5 given values) = 15

let x be the missing value:

(x+78)/6 = 15

x + 78 = 90

x = 12