statistics
posted by Angie .
a set of building blocks includes blocks of various shapes and colors. if 10% of the blocks are cubes, and 40% of the cube blocks are red, then what percentage of the blocks are red cubes

statistics 
MathMate
Assuming the colours are uniformly distributed over the shapes, we can use the multiplication rule to get
P(red cubes)=P(red)*P(cubes)=0.4*0.1=0.04
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