Okey Im going to explain you how to fill each part of the chart
Tha main part of the FDT is frecuency, for this you are going to take each weight you have, in order
41
42
44
46
etc...
Then you are going to put the frecuency, the frecuency is the number of times each value is in your data list
41 1
42 1
44 4
46 1
etc ....
Now, in this example they are asking you to set some intervals, on range for the class (minimun, maximum). Then some intervals inside this range, so you dont have to put each possible value. Something like this:
41 to 44 6
45 to 48 5
etc...