Plz asap will give !

davina wanted to estimate the typical age of the residents in a retirement community. she asked the first 15 residents entering the exercise room for their ages. nine residents were under 80, and six residents were 80 or older.

is the sample likely to be biased?

yes, because the sample is not a census of the population.

no, because the sample is a random one.

yes, because the survey is biased against those who don't use the exercise room.

no, because not all of the 15 residents who were surveyed responded.