Today in school

There are 9 girls and 11 boys in the class today. What is the probability that Suzan will go to the board today?

Correct result:

p =  0.05

Solution:

p=19+11=120=0.05p=\dfrac{ 1 }{ 9+11 }=\dfrac{ 1 }{ 20 }=0.05

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