Step 1: Understanding the Total Cards and Queen Cards.
A standard deck of cards consists of 52 cards. There are 4 queens in the deck, one from each suit (hearts, diamonds, clubs, and spades).
Step 2: Probability Formula.
The probability \( P \) of an event is given by the formula: \[ P = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} \] In this case, the number of favorable outcomes is the number of queen cards, which is 4, and the total number of outcomes is the total number of cards, which is 52.
Step 3: Substituting Values.
The probability of drawing a queen card is: \[ P(\text{Queen}) = \frac{4}{52} \] Simplifying: \[ P(\text{Queen}) = \frac{1}{13} \]
Step 4: Conclusion.
Thus, the probability of drawing a queen card from a deck of 52 cards is \( \frac{1}{13} \).
Four students of class XII are given a problem to solve independently. Their respective chances of solving the problem are: \[ \frac{1}{2},\quad \frac{1}{3},\quad \frac{2}{3},\quad \frac{1}{5} \] Find the probability that at most one of them will solve the problem.
Two persons are competing for a position on the Managing Committee of an organisation. The probabilities that the first and the second person will be appointed are 0.5 and 0.6, respectively. Also, if the first person gets appointed, then the probability of introducing a waste treatment plant is 0.7, and the corresponding probability is 0.4 if the second person gets appointed.
Based on the above information, answer the following