According to the national students' physical health standards, the perfect score standard of junior high school girls' 50-meter dash is that the time is less than or equal to 8.0 seconds, and the excellent time is less than or equal to 8.0 seconds. Ok: the time is between 8.4 and 8.7 seconds. Pass: the time is between 8.9 and 10.7 seconds. Failure: Time is greater than 10.7 second.