Hey there! :D
So, to find the experimental probability of rolling a 3, we need to make a fraction with all the frequencies combined as a denominator and the number 3's frequency as the numerator.
7+9+11+6+9+8= 50
The frequency of the number 3 is 11.
The experimental probability is 11/50.<== you can't simplify this fraction
I hope this helps!
~kaikers