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∙A similar argument works in the continuous case, but we need toswitch the order of the integration.43
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EXAMPLE: Suppose hourly wageYis related to educationXasEY|X5.8.40XIf the average education level in the population is 12.5, then we canfind the average hourly wage:EYE5.8.40X5.8.40EX5.8.4012.510.8,or $10.80.44