Follow these steps:
- Draw a picture of the normal distribution.
- Translate the problem into one of the following: p(X < a), p(X > b), or p(a < X < b). ...
- Standardize a (and/or b) to a z-score using the z-formula:
- Look up the z-score on the Z-table (see below) and find its corresponding probability.
How do you find specific probability?
Divide the number of events by the number of possible outcomes. This will give us the probability of a single event occurring.
What is the formula for calculating probabilities?
Formula for the probability of A and B (independent events): p(A and B) = p(A) * p(B). If the probability of one event doesn't affect the other, you have an independent event. All you do is multiply the probability of one by the probability of another.
