I created a pipeline by unwinding on cast, and using $sum accumulator to calculate the num_of_films by grouping on cast. I am also running match for English language, and getting the highest num_of_films as between 100 & 110. Though at submission, it is not accepting as correct answer, please suggest. I can try sending the submission string as a pm if necessary.
my bad, I was sending 2 decimal in rating.
Glad you figured it out!