Question

The mean of six numbers is 12 five of the numbers are 11 7 21 14 and 9 calculate the six numbers

Answer 1

sixth number is 10

Explanation:

(11 + 7 + 21 + 14 + 9 + x) / 6 = 12

(62 + x) / 6 = 12

cross-multiply to get:

62 + x = 72

x = 10