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The contingency table below shows smoking habits of 195 staff members of a fictitious company. Light 2 None 4 Senior Managers (SM) Junior Managers (JM) 4 Senior Employees (SE) 26 Junior Employees (JE) 18 Secretaries (SC) 11 Which one of the following statements is incorrect? 3 10 24 6 Medium Heavy 3 2 8 12 34 7 4 4 13 0 O a. The probability that a randomly chosen staff member is a junior employee and a medium smoker is 0.174. O b. The probability that a randomly chosen staff member is a junior employee or a medium smoker is 0.785. O c. The probability that a randomly chosen staff member is a junior employee is 0.456 O d. The probability that a randomly chosen staff member is a medium smoker is 0.328 e. The events secretaries and heavy smoker are mutually exclusive.

The contingency table below shows smoking habits of 195 staff members of a fictitious company. Light 2 None 4 Senior Managers (SM) Junior Managers (JM) 4 Senior Employees (SE) 26 Junior Employees (JE) 18 Secretaries (SC) 11 Which one of the following statements is incorrect? 3 10 24 6 Medium Heavy 3 2 8 12 34 7 4 4 13 0 O a. The probability that a randomly chosen staff member is a junior employee and a medium smoker is 0.174. O b. The probability that a randomly chosen staff member is a junior employee or a medium smoker is 0.785. O c. The probability that a randomly chosen staff member is a junior employee is 0.456 O d. The probability that a randomly chosen staff member is a medium smoker is 0.328 e. The events secretaries and heavy smoker are mutually exclusive.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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The contingency table below shows smoking habits of 195 staff members of a fictitious company. Light 2 3 10 24 6 None Senior Managers (SM) 4 Junior Managers (JM) 4 Senior Employees (SE) 26 Junior Employees (JE) 18 Secretaries (SC) 11 Which one of the following statements is incorrect? Medium 3 8 12 34 7 Heavy 2 4 4 13 0 a. The probability that a randomly chosen staff member is a junior employee and a medium smoker is 0.174. O b. The probability that a randomly chosen staff member is a junior employee or a medium smoker is 0.785. O c. The probability that a randomly chosen staff member is a junior employee is 0.456 O d. The probability that a randomly chosen staff member is a medium smoker is 0.328 e. The events secretaries and heavy smoker are mutually exclusive.
Transcribed Image Text:The contingency table below shows smoking habits of 195 staff members of a fictitious company. Light 2 3 10 24 6 None Senior Managers (SM) 4 Junior Managers (JM) 4 Senior Employees (SE) 26 Junior Employees (JE) 18 Secretaries (SC) 11 Which one of the following statements is incorrect? Medium 3 8 12 34 7 Heavy 2 4 4 13 0 a. The probability that a randomly chosen staff member is a junior employee and a medium smoker is 0.174. O b. The probability that a randomly chosen staff member is a junior employee or a medium smoker is 0.785. O c. The probability that a randomly chosen staff member is a junior employee is 0.456 O d. The probability that a randomly chosen staff member is a medium smoker is 0.328 e. The events secretaries and heavy smoker are mutually exclusive.
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