To find the latest average value of any cryptocurrency as well as its trading volume, market cap, charts, and links to its website, block explorer(s), and any pertinent blogs and/or forum posts about the coin (like bitcointalk), the best place to begin is https://coinmarketcap.com/ . If you click on the Markets tab you'll find a list of all the exchanges on which the coin is currently being traded, which markets/coins with which it's being traded (BTC, ETH, USD, EUR, CNY, WAVES, etc), the current price (by default USD, but you may change this to BTC, ETH, or your choice of 14 other fiat currencies) of the coin in each of those markets, and the % of the total traded volume of the coin for each market. The Social tab gives you links to Twitter and Tools gives you code for a price widget for the coin and also the link to coinmarketcap's api for it so you can remotely call for price updates in applications like trading bots. Historical Data is pretty self-explanatory. It's the charted values in spreadsheet form. With all the explanations now aside, go ahead and get started with the currency you asked about:
http://coinmarketcap.com/assets/eos/
Hope this helps!! Learning about this site is what really got me into trading digital currencies!!