Question

12. The median of the dataset is 18. What number is missing? 12, 17, 21, 13, 25​

Answer 1

Explanation:

'median' is the 'average' of the 6 numbers

(x + 12+17+21+13+25) / 6 = 18 <=== multiply both sides by '6'

x + 12 +17+21+13+25 = 108

x + 88 = 108

x = 20