The prediction of the number of red marbles in the bag should be considered as the 45.
Calculation of the number:
Since
A bag contains 100 marbles, some red and some purple.
The student has recorded 9 red marbles and 11 purple marbles.
So the total drawn be like
= 9 + 11
= 20
Now the red marbles be
[tex]= 9\div 20 \times 100[/tex]
= 45
hence, The prediction of the number of red marbles in the bag should be considered as the 45.
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