Hi,
I am wondering on finding probability from known content of a sample of normal distribution. I want to calculate its chance of occurrence between some % range.
 Here again I want to express by eg:
Let us say I have 3% of total N2O out of 100 gm different mixtures of salts. Also, N2O represents normal distribution and result after 200 times sampling from that salt mixture. Now I want to know what is the chance of getting N2O between 4 to 5 %.
I simply calculated the z scores values but I am still not sure. If anyone has suggestion I will be grateful.
Thanks.

I am using the latest version of R in windows 7.
Thanks 
Chitra


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