practice_problems/problems/unit-01/D-unions-intersections-and-complements/1

[giscus[bot]]

practice_problems/problems/unit-01/D-unions-intersections-and-complements/1

https://mids-w203.github.io/practice_problems/problems/unit-01/D-unions-intersections-and-complements/1.html

[IreneNS]

Maybe the question should be changed to ask 'how many of the students have at least one of these bad habits' instead of asking for the fraction, given we are not given the total number of the students

[IreneNS]

or rephrase the question as percentage as it seems to have suggested in the solution.

[william061490]

Right, 70 is the number of students, not fraction.

[shanis345]

Total number of students should be informed as 100 in order to make this solution valid. Else, we can only know the number of students that meet the condition. Not probability.