There are $12$ girls and $x$ boys in a group. The probability of selecting a boy randomly from t

Question

There are $12$ girls and $x$ boys in a group. The probability of selecting a boy randomly from the group is $\frac{3}{7}$. Find the value of $x$. How many more boys are needed to join the group so that the probability of selecting a boy randomly from the group will be $\frac{5}{6}$?

Accepted Answer

(a) x=9; (b) 51 more boys.

Solving for Unknown Frequencies in Probability Sets

Solving for Unknown Frequencies in Probability Sets

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