Tagged with probability …

#math trivia solution: What are the chances that a class of 20 has 10 girls and 10 boys?

#math trivia: If girls and boys are equally represented in the school population, what are the chances that a class of 20 has 10 of each? — Burt Kaliski Jr. (@modulomathy) October 16, 2012 This is another combinatorics problem. Each seat in the class will be occupied either by a girl or a boy. The … Continue reading

#math trivia solution: What are the chances that a given pair of students are born in the same month?

#math trivia: What are the chances that a given pair of students are born in the same month? Assume all 12 months equally likely — Burt Kaliski Jr. (@modulomathy) October 8, 2012 Assuming all 12 months are equally likely, the chances that a given pair of students are born in the same month is 1/12. … Continue reading

#math trivia solution: Two friends got in the same class …

#math trivia: The two friends got in the same class. Seats are assigned randomly, 4 rows of 5. What are the chances that they sit together? — Burt Kaliski Jr. (@modulomathy) September 3, 2012 The chances that the two friends are seated next to each other is 8/95.  This can be calculated as follows: The … Continue reading

#math trivia solution: 100 students are assigned randomly …

#math trivia: 100 students are assigned randomly to 5 classes of equal size. What are the chances that two friends get in the same class? — Burt Kaliski Jr. (@modulomathy) August 28, 2012 The chances that two friends get in the same class is 19 out of 99. If the classes didn’t have to be … Continue reading