find the area beneath a standard normal curve between z=0 and the point - 2.58
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The area percentage (proportion, probability) calculated using a z-score will be a decimal value between 0 and 1, and will appear in a Z-Score Table. The total area under any normal curve is 1 (or 100%). Since the normal curve is symmetric about the mean, the area on either sides of the mean is 0.5 (or 50%).
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