I doubt it's normally distributed, if you look at displays of altruism in general you got outliers who will give a lot more to charity, help more in volunteer work... but also many that don't do anything. Obviously that's not the same as caring about fellow coworkers but if I were to guess it would follow this sort of distribution more if you have a good measure for 'caring'.

I would also believe certain subgroups of workers to be more or less caring. Maybe early joiners care more about coworkers, those which have been there the longest, the ones WFH the least, religious upbringing vs non religious. Coworkers are a pretty heterogeneous groups in many companies.