The Owner of a Small Convenience Store Is Trying to Decide

question 137

Essay

The owner of a small convenience store is trying to decide whether to discontinue selling magazines. He suspects that only
5% of the customers buy a magazine and thinks that he might be able to use the display space to sell something more
profitable. Before making a final decision he decides that for one day he'll keep track of the number of customers and
whether or not they buy a magazine.
-What is the probability that he does not sell a magazine until the 8th customer? Show
work.

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Definitions:

Allele

A variant of a gene that results from mutation, with two or more such variants occupying the identical location on a chromosome.

Dominant

Referring to a trait, gene, or character that is more likely to express itself in the phenotype over another (recessive) form.

Recessive

Describes a gene that is expressed in offspring only when it is inherited from both parents, as opposed to a dominant gene.

Epigenetics

The study of heritable changes in gene expression that occur without changes to the DNA sequence itself.