During the last week of November 2020, the neighborhood of Gravesend, Brooklyn had an 8% positive rate for COVID. This means that about 8% of people who took COVID tests during the last week of November tested positive. This was the highest COVID positive rate in in city during this period of time–compare this rate to the average for Queens which was about 4%. Suppose we randomly select 10 people who tested for COVID in Gravesend. What is the probability that exactly one of them tested positive? What is the probability that none of them tested positive? What is the probability that three or more of them tested positive?

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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.