HOW TO FIND THE PROBABILITY USING THE STANDARD NORMAL CURVE
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Find P(a < Z < b).
The probability that a standard normal random variable lies in-between two values is also easy to find.
The P(a < Z < b) = P(Z < b) - P(Z < a).
For example, suppose we want to know the probability that a z-score will be greater than -1.40 and less than -1.20.
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