Question

pizza delivery the average time it takes to get a pizza delivered to a home is 30 minutes. if the standard deviation is 7 minutes, find the corresponding z score for each raw score. round z scores to at least two decimal places.
part 1 of 3
the z score corresponding to 25 minutes is - 0.71.
part: 1 / 3
part 2 of 3
the z score corresponding to 21 minutes is

Explanation:

Step1: Recall the z - score formula

The z - score formula is \(z=\frac{x-\mu}{\sigma}\), where \(x\) is the raw score, \(\mu\) is the mean, and \(\sigma\) is the standard deviation.

Step2: Identify the values

Given \(\mu = 30\) (average time), \(\sigma=7\) (standard deviation), and \(x = 21\) (raw score for part 2).

Step3: Substitute the values into the formula

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Answer:

-1.29