Question: Can someone please explain how we got the Mean, Variance, and Standard Deviation in this problem: https://www.coursehero.com/u/file/25317246/Planning-and-Scheduling/#question

Can someone please explain how we got the Mean, Variance, and Standard Deviation in this problem:

https://www.coursehero.com/u/file/25317246/Planning-and-Scheduling/#question

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