All math areasStatistics and probability, mean of a data set
Problem 1 of 17sta-001
The numbers of books that 5 students read over the summer were 11, 4, 9, 16, and 20. What is the mean number of books read per student?
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Solution walkthrough1:29
- The mean is the total shared out equally: add all the values, then divide by how many there are.
- Add the five values: books in all.
- There are students, so divide by : the mean is .
- Check: the tall bars have extra, which fills the gaps of .
- Traps: is the middle of the list as written, is the median, and is the range.