It looks like the most data points are found in the middle of the field. The extremes at both ends are underrepresented (except Java). That is a common finding,

It looks like the most data points are found in the middle of the field. The extremes at both ends are underrepresented (except Java). That is a common finding, because the probability of deviation from a “true norm” would be highest in the smallest sample. The big question is: How significantly do these datapoints deviate from the null hypothesis of “all programming languages average the same pay).