Twenty air conditioning units have been brought in for service. 11 of them have broken compressors and the remaining have broken fans. 4 units are chosen at random to be worked on. What is the variance of the number of units with broken fans? Round the answer to four decimal places.

Twenty air conditioning units have been brought in for service. 11 of them have broken compressors and the remaining have broken fans. 4 units are chosen at random to be worked on. What is the variance of the number of units with broken fans? Round the answer to four decimal places.

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Concept explainers

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

Twenty air conditioning units have been brought in for service. 11 of them have
broken compressors and the remaining have broken fans. 4 units are chosen at
random to be worked on. What is the variance of the number of units with broken
fans? Round the answer to four decimal places.

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