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Unformatted text preview: words, it is 0.3). That is because half of the curve is 0.5, and we know the right tail is 0.2. So, this area must be 0.3 This area is 0.5 of the total area under the curve due to normal curve symmetry. Total of these 2 areas equals 80% of area under the curve 1 Z=0.84 was used to answer the question. It is read from the table by finding within the table the number that comes closest to 0.8. Search in the table to find 0.7995. From that point go to the left and to the top margins to locate Z=0.84. Now use 0.84 as Z in the Z formula to find X which is the answer to the question ($517.44) 0.84 = (X 441.84) / 90. Solve for X = 517.44...
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- Spring '08