the starting and end points of the region of interest ( x 1 and x 2, the green dots).The standard deviation = σ (red dot, minimum value 0.2 for this graph), and.Instructionsĭrag any of the colored dots left or right to change the values of: We work out the probability of an event by first working out the z-scores (which refer to the distance from the mean in the standard normal curve) using the formulas shown. The gray curve on the left side is the standard normal curve, which always has mean = 0 and standard deviation = 1. The (colored) graph can have any mean, and any standard deviation. You can explore the concept of the standard normal curve and the numbers in the z-Table using the following applet. Normal Probability Distribution Graph Interactive
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