Hi!
Mean Opinion Score is being measured by Human rated from 1 to 5; 1 is the unintelligible sound and 5 is indistinguishable from human. First, I collected the data, by asking them to listen to the sound and rate the sound. This result is shown in the bar graph. The MOS is the mean of the collected sample +- standard deviation. For instance, 3.13+-1.12. I hope that this is helpful.