Let's break this problem down.
If the mean of the data set is 28, that means 28 is the average. There are seven numbers, so if we multiply 28 by 7, we get 196.
The median is 29, so if we lined up the numbers lowest to highest, 29 would be in the middle. There are seven numbers is the data set, and seven is an odd number, so we in ow that the median isn't averaged between two numbers.
Now, we have
_, _, _, 29, _, _, _.
We can subtract 196 and 29 to get 167.
I forgot how to do minimum and maximum, but hopefully this gets you somewhere.