Historically, Across Department As Bs Cs Ds Fs 20% 15% 40% 15% 10% After implementing a new teaching method, the final exam grade distribution (in counts) for 300 students was as follows: As Bs Cs Ds...

Do the data for 300 exams suggest a significant deviation from what Professor X’s distribution has been all along?

Extracted text: Historically, Across Department As Bs Cs Ds Fs 20% 15% 40% 15% 10% After implementing a new teaching method, the final exam grade distribution (in counts) for 300 students was as follows: As Bs Cs Ds Fs 50 130 60 40 20 Historically, Professor X's As Bs Cs Ds Fs 15% 20% 45% 15% 5%