It is known from experience that 1.4 percent of thecalls received by a switchboard are wrong numbers. Usethe Poisson approximation to the binomial distribution todetermine the probability that among 150 calls receivedby the switchboard 2 are wrong numbers.
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.
It is known from experience that 1.4 percent of the
calls received by a switchboard are wrong numbers. Use
the Poisson approximation to the binomial distribution to
determine the probability that among 150 calls received
by the switchboard 2 are wrong numbers.
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