Question 1041857: What is the percentage of data items in a normal distribution that lie between z=1.09 and z= 2.22 ?
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! This can be done from a z-table or a calculator.
One can estimate it, too. It is the probability something falls between the first and second standard deviations on one side, and a little more. That would be between 0.34 and 0.475 or about 0.135, as an estimate.
The actual value on calculator: 2nd VARS #2 ENTER and (1.09,2.22) ENTER =0.1246. It is lower than the estimate because we are starting from 1.09, not 1.
0.1246
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