Math

StatisticsSTATISTICS F/BUSINESS+ECONOMICS-TEXTAccording to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted ( Sysomos website, January 5, 2015). Suppose we randomly select 100 tweets. a. What is the expected number of these tweets with no reaction? b. what are the variance and standard deviation for the number of these tweets with no reaction?BuyFind*arrow_forward*

13th Edition

Anderson

Publisher: CENGAGE L

ISBN: 9781305881884

Chapter 5.5, Problem 43E

Textbook Problem

According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted (*Sysomos* website, January 5, 2015). Suppose we randomly select 100 tweets.

- a. What is the expected number of these tweets with no reaction?
- b. what are the variance and standard deviation for the number of these tweets with no reaction?

STATISTICS F/BUSINESS+ECONOMICS-TEXT

Show all chapter solutions

Ch. 5.1 - Consider the experiment of tossing a coin twice....Ch. 5.1 - Consider the experiment of a worker assembling a...Ch. 5.1 - Three students scheduled interviews for summer...Ch. 5.1 - In January the U.S. unemployment rate dropped to...Ch. 5.1 - To perform a certain type of blood analysis, lab...Ch. 5.1 - Listed is a series of experiments and associated...Ch. 5.2 - The probability distribution for the random...Ch. 5.2 - The following data were collected by counting the...Ch. 5.2 - For unemployed persons in the United States, the...Ch. 5.2 - The percent frequency distributions of job...

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