30 points.. ! i don't understand what to do with this bit confused.

  Eh, here's my best try for a table:

                       Like tv           don't like tv       total
Like reading:     70                     10                 80
 Don't like read. 20                     30               50  
      total               90                    40               130

The percentage of students that like tv as well as reading is- 70 divided by 130 which gives you .538 which in percentage is 53.8%.

The probability of a student that does not prefer to watch tv as also does not like to spend their time reading is 30 over 40 which can be simplified or reduced to 3 over 4. [30/40 reduced to 3/4]

Hope this somehow helped you :)