A teacher polled only the 8th grade students in English classrooms on what their favorite color is. She found that the favorite color of the school is blue. What kind of sample is this?

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels