We had:
27,20,34,37,21,42,39
We just need to order the number from least to greatest:
20,21,27,34,37,39,42
Means equal average which means that you had to all numbers divided with total numbers
Mean:31.4
Median means middle number. In this case, we only see one number which is 34
Median:34
Mode means that one number repeated many times,but we don't see any number in this repeated more than one times, which means there is no mode. Hope it help!