The z-score is calculated as:
$z = \frac{x - \mu}{\sigma}$
where $x$ is the value, $\mu$ is the mean, and $\sigma$ is the standard deviation.
a) For 959 boxes:
$z = \frac{959 - 800}{75} = 2.12$
Using a standard normal table, we find that the probability of a
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