/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 52 An ancient Korean drinking game ... [FREE SOLUTION] | 91Ó°ÊÓ

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An ancient Korean drinking game involves a 14-sided die. The players roll the die in turn and must submit to whatever humiliation is written on the up-face: something like "Keep still when tickled on face." Six of the 14 faces are squares. Let's call them A, B, C, D, E, and F for short. The other eight faces are triangles, which we will call \(1,2,3,4,5,6,7\), and 8 . Each of the squares is equally likely. Each of the triangles is also equally likely, but the triangle probability differs from the square probability. The probability of getting a triangle is \(0.28\). Give the probability model for the 14 possible outcomes.

Short Answer

Expert verified
Squares: 0.12 each; Triangles: 0.035 each.

Step by step solution

01

Understanding Sides and Probabilities

There are 14 sides on the die: 6 are squares (A, B, C, D, E, F) and 8 are triangles (1, 2, 3, 4, 5, 6, 7, 8). The probability of landing on any triangle is given as 0.28, which is the combined probability for all triangle faces.
02

Probability of Each Triangle

The probability of landing on any one triangle face out of the 8 is determined by equally distributing the total triangle probability. Thus, the probability for each triangle is: \[ P( ext{Triangle}) = \frac{0.28}{8} = 0.035 \]
03

Calculating Probability of Square Faces

Since all 14 outcomes must sum to a probability of 1, and the total probability of the triangle faces is 0.28, the total probability for the square faces is: \[ P( ext{Squares Total}) = 1 - 0.28 = 0.72 \]
04

Probability of Each Square

The probability of landing on any one square face out of the 6 squares is found by equally distributing the total square probability. Thus, the probability for each square is: \[ P( ext{Square}) = \frac{0.72}{6} = 0.12 \]
05

Final Probability Model

Each square face (A, B, C, D, E, F) has a probability of 0.12, and each triangle face (1, 2, 3, 4, 5, 6, 7, 8) has a probability of 0.035. This forms the complete probability model.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Probability of Triangles
Let's explore the probability model focusing on the triangular faces of a 14-sided die. In this scenario, the probability of rolling a triangle is given as 0.28. Since there are eight triangles to choose from, each must equally share this total probability.
First, we need to calculate the probability for each individual triangle. We do this by dividing the total probability for all triangles by the number of triangular faces. This division ensures an equal probability for each triangle face. The formula is as follows:
  • \[ P(\text{Triangle Face}) = \frac{0.28}{8} = 0.035 \text{, for each triangle face like } 1, 2, 3, 4, 5, 6, 7, \text{and } 8.\]
This means every time you roll the die, there's a 0.035 chance of landing on any specific triangle. It's the symmetry in their likelihood that ensures fair play in this element of the game.
Probability of Squares
When considering the square faces of the die, we approach the probability calculation in a similar manner. The total probability for the die rolls is always 1, because the probability model must account for all possible outcomes.
Given that triangles occupy 0.28 of this probability, the remaining probability must be for the squares. We subtract the triangle probability from 1 to find the total probability for squares:
  • \[ P(\text{Square Total}) = 1 - 0.28 = 0.72\]
There are 6 square faces on the die, each equally likely. Therefore, the probability for any individual square face is:\[\]
  • \[ P(\text{Square Face}) = \frac{0.72}{6} = 0.12 \text{ for each square like } A, B, C, D, E, \text{and } F.\]
Every square has a 0.12 probability when the die is rolled, indicating a higher likelihood compared to the triangles because fewer faces must share the probability.
Equal Distribution of Probability
Equal distribution of probability is key when discussing probability models like the one from our die example. This concept ensures each outcome of a particular category is equally likely, no matter what that category might be.
For our die, this concept means each square and each triangular face on it must share the total probability allotted to their respective shapes equally. This equal split is crucial because it maintains fairness and predictability in a game. Here's how you spread out the probabilities given specific conditions:
  • If you know a total probability for a group (like triangles or squares), divide that probability by the number of outcomes in the group.
  • This division gives you the probability for each individual outcome (face) within that group.
So, although triangles and squares have different total probabilities due to their differing numbers, within their respective categories, each face is treated with equity. With these principles, the foundations of fair gaming are maintained.

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