Multiplication principle + binomial distribution - math problems
Number of problems found: 5
- The test
The test contains four questions, and there are five different answers to each of them, of which only one is correct, the others are incorrect. What is the probability that a student who does not know the answer to any question will guess the right answer
- Boys and girls
There are 11 boys and 18 girls in the classroom. Three pupils will answer. What is the probability that two boys will be among them?
- Families 2
There are 729 families having 6 children each. The probability of a girl is 1/3 and the probability of a boy is 2/3. Find the the number of families having 2 girls and 4 boys.
We throw 10 times a play dice, what is the probability that the six will fall exactly 4 times?
We throw five times the dice. What is the probability that six fits exactly twice?