a) Defective rate in a production has been found to be 15%. What is the probability that there are 2 or less defective products in a sample of 7 randomly selected units in this production? b) An average of 9 traffic accidents occurred at a motorway junction between 01:00 and 04:00. What is the probability of having 2 accidents on this highway any day between 01:00 and 02:00.

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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.