To find the z-score, we use the formula: \( z = \frac{X - \mu}{\sigma} \), where \( X \) is the value we're interested in (17 grams), \( \mu \) is the mean (20 grams), and \( \sigma \) is the standard deviation (3 grams).
\[ z = \frac{17 - 20}{3} = \frac{-3}{3} =
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