7 years
First of all, half of 18 is 9, and if you divide 18 by 2.5, it results in 7.2. I hope this helps!
A. Make a list of the first 10 integers that come to your head should NOT be used
Mode = 11
Reason: 11 appeared twice, which is the most frequent number observed in this set of data.
It would be 0.2222 so it's your answer
