# Question: Find Var X and Var Y for X and Y as given

Find Var(X) and Var(Y) for X and Y as given in Problem 21.

Problem 21

Four buses carrying 148 students from the same school arrive at a football stadium. The buses carry, respectively, 40, 33, 25, and 50 students. One of the students is randomly selected. Let X denote the number of students that were on the bus carrying the randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on her bus.

Problem 21

Four buses carrying 148 students from the same school arrive at a football stadium. The buses carry, respectively, 40, 33, 25, and 50 students. One of the students is randomly selected. Let X denote the number of students that were on the bus carrying the randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on her bus.

## Answer to relevant Questions

If E[X] = 1 and Var(X) = 5, find (a) E[(2 + X)2]; (b) Var(4 + 3X). In some military courts, 9 judges are appointed. However, both the prosecution and the defense attorneys are entitled to a peremptory challenge of any judge, in which case that judge is removed from the case and is not ...How many people are needed so that the probability that at least one of them has the same birthday as you is greater than 1/2? Each of 500 soldiers in an army company independently has a certain disease with probability 1/103. This disease will show up in a blood test, and to facilitate matters, blood samples from all 500 soldiers are pooled and ...Suppose that 10 balls are put into 5 boxes, with each ball independently being put in box i with probability (a) Find the expected number of boxes that do not have any balls. (b) Find the expected number of boxes that have ...Post your question