For average salaries, why does this survey not display the sample size and variance of these mean estimates? Also, I doubt that mean estimates are the best meas

For average salaries, why does this survey not display the sample size and variance of these mean estimates? Also, I doubt that mean estimates are the best measure, rather than medians. I say that since salary data is probably multi-modally distributed with some very high earners and a largely left-skewed distribution with many low earners who do the grunt work / are less experienced.