The number of telephone calls arriving at a switchboard during any 20-minute period is known to be a Poisson random variable. From measurements, the expectation of the Poisson random variable is found to be equal
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.
The number of telephone calls arriving at a switchboard during any 20-minute period is known
to be a Poisson random variable. From measurements, the expectation of the Poisson random
variable is found to be equal to 4.
Find the probability that more than four calls will arrive during any 20-minute period.
Find the probability that no calls will arrive during any 20-minute period.
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