# The following table gives the amount of time X, in seconds, by which an automated manufacturing process

## Question:

The following table gives the amount of time X, in seconds, by which an automated manufacturing process misses the designed completion time when performing a certain task. Negative values indicate early completion, and positive values late completion.

**(a)** Find the mean and the variance of X.

**(b)** On average, how do the completion times for this particular task compare with the designed completion times?

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**Related Book For**

## Statistics For Business And Financial Economics

**ISBN:** 9781461458975

3rd Edition

**Authors:** Cheng Few Lee , John C Lee , Alice C Lee