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(b) Find the expected value and variance of the number of drinks. E(Y) = 1.55 Var(Y) = 2.85 (Type integers or decimals.)

(b) Find the expected value and variance of the number of drinks. E(Y) = 1.55 Var(Y) = 2.85 (Type integers or decimals.)

College Algebra
College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter5: Exponential And Logarithmic Functions
Section5.5: Exponential And Logarithmic Models
Problem 4ECP
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Customers at a fast-food restaurant buy both sandwiches and drinks. The joint distribution on the right summarizes the number of sandwiches (X) and drinks (Y) purchased by customers. Complete parts (a) through (f). Y (a) Find the expected value and variance of the number of sandwiches. E(X)= 1.55 Var(X) = 0.2475 (Type integers or decimals.) (b) Find the expected value and variance of the number of drinks. E(Y) = 1.55 Var(Y) = 2.85 (Type integers or decimals.) 1 drink 2 drinks 3 drinks 1 sandwich 0.35 0.10 0 X 2 sandwiches 0.20 0.25 0.10
Transcribed Image Text:Customers at a fast-food restaurant buy both sandwiches and drinks. The joint distribution on the right summarizes the number of sandwiches (X) and drinks (Y) purchased by customers. Complete parts (a) through (f). Y (a) Find the expected value and variance of the number of sandwiches. E(X)= 1.55 Var(X) = 0.2475 (Type integers or decimals.) (b) Find the expected value and variance of the number of drinks. E(Y) = 1.55 Var(Y) = 2.85 (Type integers or decimals.) 1 drink 2 drinks 3 drinks 1 sandwich 0.35 0.10 0 X 2 sandwiches 0.20 0.25 0.10
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