8.1 Expected Value and Standard Deviation

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Lab 8.1.1

The random variable X is defined as the number of times a graduating senior changed majors. The probability distribution of X is given below.

| | | | | | | | | | | | |-|-|-|-|-|-|-|-|-|-|-| |x| 0|1 |2 |3 |4 |5 |6 |7 |8 |p(x) |0.197 |0.212 |0.255 |0.182 |0.09 |0.04 |0.02 |0.003 |0.001

1. What is the mean number of times students changed majors?
2. What is the standard deviation of X?

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Adapted from Python for Introductory Statistics: Student's Lab Workbook, by Simon Aman (Truman College, City Colleges of Chicago), licensed under CC BY 4.0. Changes were made: reformatted as an accessible XYZ web edition with live in-browser code cells. License: CC-BY-4.0.