Question 4 In an international school, each staff has to take place in at least 3 community services in a year. The following table represents the probability distribution function of the number of community services (X) a staff has been taken in a year. X 3 4 P(X x) 0.2k k 0.35 0.2 0.03 (a) What is the value of k? (b) Find E(X) and o (X). (c) Suppose the number of community services have been taken by staffs are independent. In a department with 11 staffs, what is the probability that exactly 7 staffs have taken place in at least 5 services?
Question 4 In an international school, each staff has to take place in at least 3 community services in a year. The following table represents the probability distribution function of the number of community services (X) a staff has been taken in a year. X 3 4 P(X x) 0.2k k 0.35 0.2 0.03 (a) What is the value of k? (b) Find E(X) and o (X). (c) Suppose the number of community services have been taken by staffs are independent. In a department with 11 staffs, what is the probability that exactly 7 staffs have taken place in at least 5 services?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.9: Independent And Dependent Events
Problem 17E
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