Can mean be found from a histogram? Explain

http://www.google.com/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Histogram_of_arrivals_per_minute.svg/2000px-Histogram_of_arrivals_per_minute.svg.png&imgrefurl=http://en.wikipedia.org/wiki/Histogram&h=207&w=244&tbnid=Ts7swdbLHHtpvM:&zoom=1&tbnh=160&tbnw=188&usg=___fdItknNn_rWn-UGU28d9gyu6pc=&docid=am6aaPANqdao3M&itg=1

What do you think?