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A normal distribution bell curve graph showing mean at 23.33 (z=0), an area of 0.5 to the left, and a shaded area of 0.1368 between z=0 and 0.35.

A normal distribution bell curve graph showing mean at 23.33 (z=0), an area of 0.5 to the left, and a shaded area of 0.1368 between z=0 and 0.35.
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A bell-shaped curve represents the normal distribution. The center of the curve is at the mean age of 23.33, which has a Z-score of 0. A vertical line is drawn to the right of the mean, representing the age with a Z-score of 0.35. The area under the curve to the left of the mean is 0.5. The area under the curve between the mean and the Z-score of 0.35 is shaded and labeled as 0.1368. The total area to the left of the Z-score of 0.35, which represents the proportion of respondents who married earlier than this age, is the sum of the two areas. See more

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