How do you know what is typical?

What we do know is that there were demonstrations in over a dozen cities. Few if any of the demonstrators were reported to have been armed. Over 30 have been killed by Iranian authorities How many police have been killed? I have only heard of 1.

http://thehill.com/policy/international/366993-police-officer-killed-3-others-wounded-by-iranian-protester-report?amp