Answer:
1. Median is 79 (in)
(78+80/2 => gives halfway point)
2. 7 (in)
(IQR is UQ - LQ => that is 82 - 75)
3. LQ is 75 (in)
4. Maximum height is 84 (in)
(the largest value or the tallest you could be)
I've included units - pretend they don't exist.
Hope this helps!