Practice Students

harpazo

Pure Mathematics
If 3/7 of students wear backpacks and 2/5 of students are not in full school uniform, find the probability that a student is wearing a backpack and is in full school uniform.
 

MarkFL

La Villa Strangiato
Math Helper
[MATH]P(X)=\frac{3}{7}\left(1-\frac{2}{5}\right)=\frac{9}{35}[/MATH]
 

harpazo

Pure Mathematics
Good.
 

Jason

Well-known member
The thing to spot here - is the fact that the ones without school uniforms are the only other group - and they obviously - don't have backpacks!
 
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