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A 14-sided Die. An ancient Korean drinking game involves a 14sided die. The players roll the die in turn and must submit to what ever 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 \(A, B, C\), \(\mathrm{D}, \mathrm{E}\), and \(\mathrm{F}\) 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 out comes.

Short Answer

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

Step by step solution

01

Understand the Problem

We have a 14-sided die with two types of faces: 6 squares and 8 triangles. We need to determine probabilities for each outcome, knowing triangles have a probability of 0.28.
02

Calculate Triangle Probability

There are 8 triangle faces, so the probability of a triangle face is given as 0.28. Therefore, the probability of rolling any specific triangle (e.g., 1, 2, 3) is 0.28 divided by the number of triangles.
03

Compute Individual Triangle Probability

Calculate the probability of any specific triangle face: \( P(\text{triangle}) = \frac{0.28}{8} = 0.035 \).
04

Determine Probability of Squares

Since the total probability must sum to 1, the probability of rolling any of the square faces is the remaining probability after the triangles.
05

Calculate Remaining Probability for Squares

The total probability occupied by triangles is \( 8 \times 0.035 = 0.28 \). Therefore, the probability for all squares combined is \( 1 - 0.28 = 0.72 \).
06

Compute Individual Square Probability

Calculate the probability of any specific square face: \( P(\text{square}) = \frac{0.72}{6} = 0.12 \).
07

Compile Probability Model

The complete probability model is: \( P(A) = P(B) = P(C) = P(D) = P(E) = P(F) = 0.12 \) and \( P(1) = P(2) = P(3) = P(4) = P(5) = P(6) = P(7) = P(8) = 0.035 \).

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Key Concepts

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

Discrete probability distribution
A discrete probability distribution is a mathematical function that provides the probabilities of occurrence of different possible outcomes for an experiment that can be considered as consisting of discreet events. In simpler terms, it's like a list of outcomes with their corresponding probabilities.

In our current scenario of the 14-sided die, each face—whether square or triangle—is an outcome of rolling the die. Since there are only 14 possible outcomes, and we know the probability of each, this situation can be perfectly described by a discrete probability distribution.

  • Each square face in our distribution has its own probability of appearance, calculated as 0.12.
  • Similarly, each triangle face comes with a probability of 0.035.
These probabilities are discrete because each face represents an isolated, countable possibility. The crucial detail to remember is that the sum of all probabilities must equal 1. This ensures that our probability model is complete and accurate.
Probability model
A probability model is an idealized mathematical representation of a random phenomenon. It consists of two main parts: a list of all possible outcomes and the probability of each outcome.

In the context of our problem, the probability model allows us to map out the entire scenario of rolling the 14-sided die. Let's break it down:

  • List all outcomes: Eight triangle faces (numbered 1 to 8) and six square faces (A to F).
  • Assign probabilities: Each triangle has a probability of 0.035, while each square has a probability of 0.12.
This model not only provides the probabilities but also formalizes the situation, making it easier to calculate and predict outcomes based on the 14-sided die. With this model, you can understand how likely an event is and develop strategies or predictions accordingly.
Remember, a complete probability model is essential for analyzing the likelihood of different results in any situation involving randomness.
Dice probability
Dice probability refers to the chances of the various outcomes when rolling a die, taking into account factors such as the number of faces and the uniformity of the die. Traditional six-sided dice have equal probabilities for each face. However, the 14-sided die in our exercise introduces a more complex scenario.

Because this die has two types of faces, squares, and triangles, with different probabilities for each type, it doesn't follow the typical equal distribution rule. Here's what to remember:

  • Triangle faces have a uniform probability of 0.035 per face.
  • Square faces are slightly more likely to occur with a probability of 0.12 each.
Understanding dice probability helps us anticipate the outcomes of rolling the die within the given constraints. It allows us to grasp the likelihood of any specific instruction or action that may be on a particular face, which is particularly useful in games of chance, strategy, or gambling. Getting comfortable with these calculations and concepts can also aid in developing better decision-making skills in similar random scenarios.

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Most popular questions from this chapter

Find \(P(-2

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