b) Suppose that the number of calls at a switch board during a 30 minute time interval is known to be a random variable having a poisson probability distribution with parameter ?=3. Find the probability that during a given 30 minutes, ?2 i) Exactly 4 calls will be received ii) More than 4 calls will be received iii) At least one call will be received
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.
b) Suppose that the number of calls at a switch board during a 30 minute time interval is known to be a random variable having a poisson
?2
i) Exactly 4 calls will be received
ii) More than 4 calls will be received
iii) At least one call will be received
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