a popular restaurant chain advertises that it delivers orders within 30 minutes. suppose the average…

Explanation:

Step1: Recall z - score formula

The z - score formula is $z=\frac{x-\mu}{\sigma}$, where $x$ is the data point, $\mu$ is the mean, and $\sigma$ is the standard deviation.

Step2: Identify values

We have $x = 35$ (the delivery time of the particular order), $\mu=27$ (the average delivery time), and $\sigma = 3$ (the standard deviation).

Step3: Substitute values into formula

$z=\frac{35 - 27}{3}=\frac{8}{3}\approx2.67$

Answer:

D. 2.67