Four buses carrying 151 high school students arrive to Montreal. The buses carry, respectively,33 , 44, 32, and 42 students. One of the studetns is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y : E(X) = Var (X)= E(Y)= Var(Y)=

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter9: Solving Quadratic Functions
Section: Chapter Questions
Problem 4CA
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Four buses carrying 151 high school students arrive to Montreal. The buses carry, respectively,33 , 44, 32, and 42 students. One of the studetns is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y :

E(X) =

Var (X)=

E(Y)=

Var(Y)=

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