A Bank Offers Online Banking to Its Customers Free of Charge

question 55

Essay

A bank offers online banking to its customers free of charge. While online, customers can also sign up for additional services that the bank offers. Let $x$ be the number of customers who sign up for additional services online each day. Suppose the distribution of $x$ is approximated well by a Poisson distribution with mean $\lambda = 42.3$ . Find $E ( x )$ and interpret its value.

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Definitions:

Supergroup

In phylogenetics, a high-level taxonomic rank above the rank of kingdom, used to organize the diversity of eukaryotes especially.

Alveolates

A group of protists, including dinoflagellates, apicomplexans, and ciliates, characterized by the presence of alveoli (small sac-like structures) beneath their cell membranes.

Representative Clade

A group of organisms that includes an ancestor and all of its descendants, representing a single branch on the tree of life.

Supergroup

In biology, a high-level classification rank above kingdom, used in some recent taxonomic systems to organize the diversity of life.