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Estimated productivity for a score

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If the regresion line between x (score on manual dexterity) and y (units produced per hour) is, ? = 19.2 + 3.0x, then the estimated productivity for a score of 15 will be:

1.) 64.2
2.) 15.0
3.) 45.0
4.) 19.2
5.) 3.0

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