conforming with or constituting a norm or standard or level or type or social norm; not abnormal | lacking special distinction, rank, or status; commonly encountered |
in accordance with scientific laws | around the middle of a scale of evaluation |
being approximately average or within certain limits in e.g. intelligence and development | lacking exceptional quality or ability |
forming a right angle | relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values) |
| approximating the statistical norm or average or expected value |
| relating to or constituting the most frequent value in a distribution |