Question

A jar contains 30 red marbles 50 blue marbles and 20 white marbles what is the the theoretical probability of choosing a white marble

Answer 1

Theoretical probablity=desiredoutcomes/totalpossibleoutcomes

desired=number of white marbles=20
total possible=red+blue+white=30+50+20=100

so theoretical probablity=20/100=2/10=0.2=20%

Answer 2

$\frac{white\ marbles}{all\ marbles}= \frac{20}{20+3+50} = \frac{20}{100} =\boxed{ \frac{1}{5} } \\ \\ \\ \\ \\ "Non\ nobis\ Domine,\ non\ nobis,\ sed\ Nomini\ tuo\ da\ gloriam." \\ \\ \\ \underline{\underline{Regards\ M.Y.}}$