dipulata,
if you open this link in yahoo
http://finance.yahoo.com/q/ks?s=HNZ

there is a section called "Share Statistics" you can get your information from there.

i am no expert but here are few rules to follow by:
1. invest only that one can afford to lost
2. do your homework before jumping into stock
3. do not get greedy. set a target price when you buy a stock and follow it.
4. lock in profit when your target is reached. capital preservation is key.