I'd suggest that at some point someone in the class call the local newspaper
and the local police. This would apply best to a larger city.
Both types of organizations perform estimates of crowd sizes, and they
often differ in their results. So, I'd ask them how they do it. In fact
there must be professional guidelines for doing this.
Failing this, I'd count the number of feet and divide by two.
Philip Mahler
Middlesex CC
Bedford, MA
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