Arandom sample of 200 dancers were asked if they practice dancing 20 h or more per week. the results are shown in the table.

Correct; incorrect; incorrect

Step-by-step explanation:

In the table, we see that there were 113 ballet dancers.  All of them practice 20 hours or more each week.  This means the first statement, "The ballet dancers practice 20 h or more per week," is correct.

We see that there are 87 jazz dancers.  None of them practice 20 hours or more each week.  This means the second statement, "The jazz dancers practice 20 h or more per week," is incorrect.

The last statement is also incorrect; this is because since ballet dancers all practice 20 hours or more, and none of the jazz dancers practice 20 hours or more, the type of dancing seems to directly affect the number of hours practiced per week.