Question

In a popular online role playing game, players can create detailed designs for their character's "costumes," or appearance. Landon sets up a website where players can buy and sell these costumes online. Information about the number of people who visited the website and the number of costumes purchased in a single day is listed below.

28 visitors purchased no costume.
319 visitors purchased exactly one costume.
34 visitors purchased more than one costume.

Based on these results, express the probability that the next person will purchase exactly one costume as a fraction in simplest form.

Answer 1

319/381

Explanation:

You want the probability that a customer will buy exactly one costume, given that the numbers buying 0, 1, or >1 costumes were 28, 319, and 34, respectively.

Exactly one

The probability is the ratio of customers buying one to total customers:

P(n=1) = 319/(28 +319 +34) = 319/381

This fraction cannot be reduced, so ...

The probability the next person will purchase exactly one costume is 319/381.

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