Over 500 million tweets are sent per day (Digital Marketing Ramblings website, December 15, 2014). Assume that the number of tweets per hour follows a Poisson distribution and that Bob receives on average 7 tweets during his lunch hour. a. What is the probability that Bob receives no tweets during his lunch hour? b. What is the probability that Bob receives at least 4 tweets during his lunch hour? c. What is the expected number of tweets Bob receives during the first 30 minutes of his lunch hour? d. What is the probability that Bob receives no tweets during the first 30 minutes of his lunch hour?
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Over 500 million tweets are sent per day (Digital Marketing Ramblings website,
December 15, 2014). Assume that the number of tweets per hour follows a Poisson distribution and that Bob receives on average 7 tweets during his lunch hour.
a. What is the probability that Bob receives no tweets during his lunch hour?
b. What is the probability that Bob receives at least 4 tweets during his lunch hour?
c. What is the expected number of tweets Bob receives during the first 30 minutes of his
lunch hour?
d. What is the probability that Bob receives no tweets during the first 30 minutes of his
lunch hour?
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